Question

I need help in conversation of
sin to cos type like is it correct. sin(π/2+theta) = cos theta
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Answer 1

Step-by-step explanation:

π/2= 90°

sin(90+A)= cos A

sin (90+A) lies in 2nd quadrant .

Sine and cosecant values are positive in the 2nd quadrant.

Sin -> Cos

Cosec -> Sec

Sin120°=Sin(90+30)=cos 30=√3/2