JEE MATHEMATICS MCQ: TRIGONOMETRIC EQUATIONS

1 Easy

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Analyzing +4 | -1

\cos \,\,2x = \left( {\sqrt 2 + 1} \right)\,\,\left( {\cos \,\,x - \frac{1}{{\sqrt 2 }}} \right),\,\,\cos \,\,x \ne \frac{1}{2}

, then

x \in I

View answer and explanation

Correct option: D

\left\{ {2n\pi \,\, \pm \,\,\frac{\pi }{4}:n \in Z} \right\}

Option D (

\{ {2n\pi \pm \frac{\pi }{4}:n \in Z} \}

) is correct because it represents the general solution obtained after solving the given trigonometric equation.

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\mathrm{X}

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