Question

prove this question it's from icse R K Bansal book stage 3 q. 131 from trigonometry.

Answer 1

SinA. Cos(90-A).cosA/sin(90-A) +cosA.sin(90-A).sinA/cos(90-A)
=sinA.sinA.cosA/cosA + cosA.cosA.sinA/sinA
=sin²A + cos²A
= 1

Answer 2

Hi friend,

We have to know ,

Sin (90°- θ)= cosθ
Cos (90°-θ) = sinθ

Sub.in the given equation,it becomes ,

Sin²θ + cos²θ it becomes 1.

We know that

Sin²θ + cos²θ= 1.

:- the answer is 1.

Hope this helped you a little!!!!