Question

2. Why does the sin Ɵ = cos (90 – Ɵ)?


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Answer 1

R.H.S:

= cos ( 90 - theta )

= cos (90) cos(theta) + sin(90) sin(theta)

= 0 + sin(theta) =>[ cos(90) = 0 , sin(90) = 1]

= sin(theta)