JEE MATHEMATICS MCQ: TRIGONOMETRIC EQUATIONS

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Analyzing +4 | -1

The equation

{\cos ^4}x - \left( {\lambda + 2} \right){\cos ^2}x - \left( {\lambda + 3} \right) = 0

possesses a solution, if

View answer and explanation

Correct option: C

- 3 \le \lambda \le - 2

Option C (

- 3 \le \lambda \le - 2

) is correct because it is the range of

\lambda

that satisfies the condition

0 \le {\cos ^2}x\, \le 1

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