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$cosθ + \cos (π + θ) + \cos (2 π + θ) + \dots \dots \dots +$ $\cos (20 π + θ) =$

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$- cosθ$

$sinθ$

$cosθ$

answer is B.

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Detailed Solution

$cosθ + \cos (π + θ) + \cos (2 π + θ) + . . . . . . . + \cos (20 π + θ) = cosθ - cosθ + cosθ - cosθ + . . . . . . . + cosθ = cosθ$

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