Question

2 sin ^2 A - cos ^2 A =2, find the value of A.
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Answer 1

Answer:

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Answer 2

Answer:

A = 90°

Step-by-step explanation:

We have

2 sin2 A - cos2 A = 2

2 sin2 A - cos2 A = 2(sin2 A + cos2 A)

2 sin2 A - cos2 A = 2sin2 A + 2cos2 A

3cos2 A = 0

cos A = 0

cos A = 90°