JEE MATHEMATICS MCQ: TRIGONOMETRIC EQUATIONS

1 Easy

1 of 1

Analyzing +4 | -1

If the equation

\cos \,\,3x\,\,{\cos ^3}\,\,x + \sin \,\,3x\,\,{\sin ^3}\,\,x = 0

, then

x

is equal to

View answer and explanation

Correct option: A

\left( {2n + 1} \right)\,\,\frac{\pi }{4}

Option A (

\left( {2n + 1} \right)\frac{\pi }{4}

) is correct because it is derived from simplifying the trigonometric equation and solving for x.

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\mathrm{X}

\theta \rightarrow \frac{\pi}{2}

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0 < x < \pi

\cos x+\sin x=\frac{1}{2}

\tan x