Question

if cos 2a = sin(A-15) FIND A​

Answer 1

Solution :-

$\cos(2a) = \sin(a - 15) \\ \\ \sin(90 - 2a) = \sin(a - 15) \\ \\ 90 + 15 = a + 2a \\ \\ 105 = 3a \\ \\ 35 = a$

☑ Answer is 35 ...

Hope it helps ❤☑✌

Answer 2

Answer:

Cos 2A = Sin(A-15)

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

90 - 2A = A - 15

90 + 15 = A + 2A

105 = 3A

A = 105/3 = 35