Question

The set of all values of $λ$ for which the equation $cos^2⁡2x−2sin^4⁡x−2cos^2⁡x=λ$ has a real solution x, is

• A. $[-1,-\frac{1}{2}]$
• B. $[-\frac{3}{2},-1]$
• C. $[-\frac{3}{2},-1]$
• D. [-2,-1]

Answer 1

Answer: (B)

$[-\frac{3}{2},-1]$

Answer 2

The Correct Option is (B): $[-\frac{3}{2},-1]$