WBJEE 2016 Math Solved Paper

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Question : 43 of 75

Marks: +1, -0

1 +

n

‌

C1 cos θ +

n

‌

C2 cos 2θ + ..... +

n

‌

Cn cos nθ equals

(2cos
θ
2
)n cos
nθ
2
2cos2
nθ
2
2cos2
θ
2
(2cos
θ
2
)n

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