1.

If cosƟ+cos2Ɵ =1,the value of sin2Ɵ+sin4Ɵ is(a) -1(b) 0(c) 1(d) 2

Answer»

Correct answer is: (c) 1

CosƟ = I-cos2Ɵ = sin2Ɵ 

Therefore 

Sin2Ɵ + sin4Ɵ = cosƟ + cos2Ɵ = 1



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