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Q.

cos2(450α)+cos2(150+α)cos2(150α)

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a

2

b

1

c

0

d

1/2

answer is C.

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Detailed Solution

cos2(450α)+cos2(150+α)cos2(150α)

We know that 1+cos2θ=2cos2θ

1+cos(9002α)2sin(30).sin(2α)=12+12sin2α12sin2α=12

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