Question

If cos 2A = sin (A - 15) find A. ​

Answer 1

Step-by-step explanation:

cos 2A = sin (A -15)

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

Now,

90- 2A = A-15

90+15 = 2A +A

105 = 3A

105/3= A

35=A

since, A = 35

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