JEE MATHEMATICS MCQ: TRIGONOMETRIC EQUATIONS

1 Easy

1 of 1

Application +4 | -1

\sin \,\,2x\,\,\cos \,\,2x\,\,\cos \,\,4x = \lambda

has a solution, then

\lambda

lies in the interval

View answer and explanation

Correct option: B

\left[ { - 1/4,\;1/4} \right]

Option B ([ - 1/4, 1/4 ]) is correct because the range of

\sin 8x

is [-1, 1], which constrains the possible values of

\lambda

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