Question

15. If 2sin2 - cos2 = 2, then find the value of A.

Answer 1

Answer:

Given, 2sin

2

θ−cos

2

θ=2

⇒2sin

2

θ−1+sin

2

θ=2

⇒3sin

2

θ−1=2

⇒sin

2

θ=1

⇒sinθ=sin90

0

⇒θ=90

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