In Trigonometry, different species of difficulties can be fixed using trigonometry formulas. These problems may include trigonometric ratios (sin, cos, tan, sec, cosec and also cot), Pythagorean identities, product identities, etc. Part formulas consisting of the authorize of ratios in various quadrants, including co-function identities (shifting angles), amount & distinction identities, dual angle identities, half-angle identities, etc. Are additionally given in brief here.

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Learning and memorizing these math formulas in trigonometry will help the college student of class 10, 11, and 12 to score great marks in this concept. Lock can discover the trigonometry table in addition to inverse trigonometry recipe to fix the problems based on them.

Trigonometry formulas PDF

Below is the link given to download the pdf style of Trigonometry formulas for totally free so that students deserve to learn them offline too.


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Trigonometry is a branch of mathematics that faces triangles. Trigonometry is likewise known together the examine of relationships in between lengths and also angles of triangles.

There is one enormous variety of uses the trigonometry and its formulae. For example, the an approach of triangulation is offered in geography to measure the distance in between landmarks; in Astronomy, to measure up the distance to nearby stars and likewise in satellite navigation systems.


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Trigonometry recipe List

When us learn around trigonometric formulas, we take into consideration them for right-angled triangles only. In a right-angled triangle, we have actually 3 sides namely – Hypotenuse, Opposite side (Perpendicular), and surrounding side (Base). The longest side is well-known as the hypotenuse, the next opposite come the edge is perpendicular and also the side whereby both hypotenuse and also opposite next rests is the nearby side.

Here is the perform of formulas for trigonometry.

Basic Trigonometric role Formulas

There are basically 6 ratios supplied for recognize the aspects in Trigonometry. Lock are called trigonometric functions. The six trigonometric attributes are sine, cosine, secant, co-secant, tangent and also co-tangent.

By utilizing a right-angled triangle together a reference, the trigonometric functions and also identities are derived:

sin θ = Opposite Side/Hypotenusecos θ = surrounding Side/Hypotenusetan θ = Opposite Side/Adjacent Sidesec θ = Hypotenuse/Adjacent Sidecosec θ = Hypotenuse/Opposite Sidecot θ = Adjacent Side/Opposite Side

Reciprocal Identities

The Reciprocal Identities are given as:

cosec θ = 1/sin θsec θ = 1/cos θcot θ = 1/tan θsin θ = 1/cosec θcos θ = 1/sec θtan θ = 1/cot θ

All these room taken from a ideal angled triangle. Once height and also base next of the ideal triangle room known, we can uncover out the sine, cosine, tangent, secant, cosecant, and also cotangent values making use of trigonometric formulas. The mutual trigonometric identities are also derived by utilizing the trigonometric functions.

Trigonometry Table

Below is the table because that trigonometry formulas for angle that are commonly used for addressing problems.


Angles (In Degrees)30°45°60°90°180°270°360°
Angles (In Radians)π/6π/4π/3π/2π3π/2
sin01/21/√2√3/210-10
cos1√3/21/√21/20-101
tan01/√31√300
cot√311/√300
csc2√22/√31-1
sec12/√3√22-11

Periodicity Identities (in Radians)

These formulas are offered to shift the angles by π/2, π, 2π, etc. Lock are additionally called co-function identities.

sin (π/2 – A) = cos A & cos (π/2 – A) = sin Asin (π/2 + A) = cos A & cos (π/2 + A) = – sin Asin (3π/2 – A) = – cos A & cos (3π/2 – A) = – sin Asin (3π/2 + A) = – cos A & cos (3π/2 + A) = sin Asin (π – A) = sin A & cos (π – A) = – cos Asin (π + A) = – sin A & cos (π + A) = – cos Asin (2π – A) = – sin A & cos (2π – A) = cos Asin (2π + A) = sin A & cos (2π + A) = cos A

All trigonometric identities are cyclic in nature. Castle repeat us after this periodicity constant. This periodicity continuous is different for different trigonometric identities. Tan 45° = tan 225° but this is true because that cos 45° and cos 225°. Refer to the over trigonometry table come verify the values.

Co-function Identities (in Degrees)

The co-function or routine identities can additionally be stood for in degrees as:

sin(90°−x) = cos xcos(90°−x) = sin xtan(90°−x) = cot xcot(90°−x) = tan xsec(90°−x) = csc xcsc(90°−x) = sec x

Sum & difference Identities

sin(x+y) = sin(x)cos(y)+cos(x)sin(y)cos(x+y) = cos(x)cos(y)–sin(x)sin(y)tan(x+y) = (tan x + tan y)/ (1−tan x •tan y)sin(x–y) = sin(x)cos(y)–cos(x)sin(y)cos(x–y) = cos(x)cos(y) + sin(x)sin(y)tan(x−y) = (tan x–tan y)/ (1+tan x • tan y)

Double angle Identities

sin(2x) = 2sin(x) • cos(x) = <2tan x/(1+tan2 x)>cos(2x) = cos2(x)–sin2(x) = <(1-tan2 x)/(1+tan2 x)>cos(2x) = 2cos2(x)−1 = 1–2sin2(x)tan(2x) = <2tan(x)>/ <1−tan2(x)>sec (2x) = sec2 x/(2-sec2 x)csc (2x) = (sec x. Csc x)/2

Triple angle Identities

Sin 3x = 3sin x – 4sin3xCos 3x = 4cos3x-3cos xTan 3x = <3tanx-tan3x>/<1-3tan2x>

Half angle Identities

\(\sin\fracx2=\pm \sqrt\frac1-\cos\: x2\)\(\cos\fracx2=\pm \sqrt\frac1+\cos\: x2\)\(\tan(\fracx2) = \sqrt\frac1-\cos(x)1+\cos(x)\)

Also, \(\tan(\fracx2) = \sqrt\frac1-\cos(x)1+\cos(x)\\ \\ \\ =\sqrt\frac(1-\cos(x))(1-\cos(x))(1+\cos(x))(1-\cos(x))\\ \\ \\ =\sqrt\frac(1-\cos(x))^21-\cos^2(x)\\ \\ \\ =\sqrt\frac(1-\cos(x))^2\sin^2(x)\\ \\ \\ =\frac1-\cos(x)\sin(x)\) So, \(\tan(\fracx2) =\frac1-\cos(x)\sin(x)\)

Product identities

\(\sin\: x\cdot \cos\:y=\frac\sin(x+y)+\sin(x-y)2\)\(\cos\: x\cdot \cos\:y=\frac\cos(x+y)+\cos(x-y)2\)\(\sin\: x\cdot \sin\:y=\frac\cos(x-y)-\cos(x+y)2\)

Sum come Product Identities

\(\sin\: x+\sin\: y=2\sin\fracx+y2\cos\fracx-y2\)\(\sin\: x-\sin\: y=2\cos\fracx+y2\sin\fracx-y2\)\(\cos\: x+\cos\: y=2\cos\fracx+y2\cos\fracx-y2\)\(\cos\: x-\cos\: y=-2\sin\fracx+y2\sin\fracx-y2\)

Inverse Trigonometry Formulas

sin-1 (–x) = – sin-1 xcos-1 (–x) = π – cos-1 xtan-1 (–x) = – tan-1 xcosec-1 (–x) = – cosec-1 xsec-1 (–x) = π – sec-1 xcot-1 (–x) = π – cot-1 x

What is Sin 3x Formula?

Sin 3x is the sine of three times the an edge in a right-angled triangle, the is express as:

Sin 3x = 3sin x – 4sin3x

Trigonometry recipe From class 10 to course 12


Trigonometry formulas For course 12
Trigonometry recipe For course 11
Trigonometry formulas For course 10

Trigonometry Formulas major systems

All trigonometric recipe are separated into two major systems:

Trigonometric IdentitiesTrigonometric Ratios

Trigonometric Identities space formulas that involve Trigonometric functions. These identities space true for all worths of the variables. Trigonometric proportion is well-known for the relationship between the measure of the angles and the length of the political parties of the best triangle.

Here we provide a list of all Trigonometry formulas for the students. This formulas are valuable for the college student in solving problems based upon these recipe or any kind of trigonometric application. Together with these, trigonometric identities help us to derive the trigonometric formulas, if castle will show up in the examination.

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We also provided the basic trigonometric table pdf that gives the relationship of every trigonometric functions along with their conventional values. This trigonometric formulae are beneficial in identify the domain, range, and also value that a compound trigonometric function. Students have the right to refer to the formulas detailed below or can additionally download the trigonometric formulas pdf that is provided above.