The general solution of the equation $\cos \,\,x\,\;{\rm{cos}}\,\;6x = - 1$ is

JEE MATHEMATICS MCQ: TRIGONOMETRIC EQUATIONS

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Analyzing +4 | -1

The general solution of the equation

\cos \,\,x\,\;\mathrm{cos}\,\;6x = - 1

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Correct option: A

x = \left( {2n + 1} \right)\pi ,\,\,n \in Z

Option A is correct because the general solution is derived by setting both cos(x) and cos(6x) to -1 and finding the common solution.

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