समीर चुटिया मेरेको भूल गया| :(
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Answer:
Sameer Cutia forgot me
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cos3θ=cos(2θ+θ)
=cos2θcosθ−sin2θsinθ
=(cos2θ−sin2θ)cosθ−2sinθcosθsinθ
=cos3θ−sin2cosθ−2sin2θcosθ
=cosθ(cos2θ−sin2θ−2sin2θ)
=cosθ(cos2θ−3sin2θ)
=cos3θ−3sin2θcosθ
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