1.

If 2sin2β – cos2β = 2, then β is(a) 0ᵒ(b) 90ᵒ(c) 45ᵒ(d) 30ᵒ

Answer»

Correct answer is: (b) 90ᵒ

2sin2β – cos2β = 2

Then 2 sin2β – (1- sin2β) = 2

3 sin2β =3 or sin2β =1

β is 90ᵒ



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