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The general solution of $\cos x \cos 6 x + 1 = 0$ is

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x=(2 n+1)π,n ∈ z

x=2 nπ,n ∈ z

x= nπ,n ∈ z

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Correct option is A

We have 2cosxcos6x=−2⇒cos7x+cos5x=−2⇒cos7x=−1 and cos5x=−1⇒x=2nπ+π,n∈Z

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The general solution of cosx cos6x+1=0 is

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The general solution of $\cos x \cos 6 x + 1 = 0$ is