Answer:
Trigonometric functions can be simply defined as the functions of an angle of a triangle.
The basic trigonometric functions are sine, cosine, tangent, cotangent, secant and cosecant.
sine sum identity:
In sine sum identity , sin(x), cos(x), sin(y) and cos (y) is used.
Some identities shown below,
Explanation:
so its c cos(x)
