Question

what is mean by cos and sin

Answer 1

Definition. The sine and cosine functions can be defined in a number of ways: Definition I: From a triangle. Given any angle q (0 £ q £ 90°), we can find the sine or cosine of that angle by constructing a right triangle with one vertex of angle q.

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Answer 2

cos and sin individually don't mean anything .
they are meaning full with specific angles in a right angled triangle
cos theta = base / hypotenuse
sin theta = perpendicular/ hypotenuse