Question

prove that sin 270 +A =-cos A​

Answer 1

Step-by-step explanation:

LHS sin(270+a)= sin (90×3+a)

=-cos a.

$sin(90n + a) = - \cos(a)$

Answer 2

Answer:

proof:- L.H.S= sin (270-A)= sin [90-(-180+A)]= cos{-(180-A)}=cos(180-A)=cos [90-(-90-A)]=sin {-(90-A)}=-[sin (90-A)]=-[cosA]=-cosA =R.H.S

hence ,proved..

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