Question

If cos 2A = sin (A-15 ) ,find A. ​

Answer 1

Hi !

Solution :- cos2A = sin ( A - 15)

=>, sin ( 90° - 2A ) = sin( A - 15)

=> 90° - 2A = A - 15

=> 3A = 105

A = 105/3 = 35° Answer ✔

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Hope it helps you !!

@Raj❤

A =

Answer 2

cos 2A=sin(A-15)

sin(90-2A)=sin(A-15)

90-2A=A-15

3A=105

A=35