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Q. The simplified form of the expression 2 + 2 + 2 + 2 cos 8 θ is
A. 4 cos 2 θ
B. 4 cos θ
C. 2 cos 2 θ
D. 2 cos θ

formula used1+cos 2x=2cos2x2+2+2+2cos 8θ=2+2+21+cos 8θ=2+2+22cos2 4θ=2+2+4cos2 4θ=2+2+2cos 4θ=2+21+cos 4θ=2+22cos2 2θ=2+4cos2 2θ=2+2cos 2θ=21+cos 2θ=22cos2 θ=4os2 θ=2cos θ

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