If the equation $\cos ^{4} \theta+\sin ^{4} \theta+\lambda=0$ has real solutions for $\theta,$ then $\lambda$ lies in the interval
If the equation $\cos ^{4} \theta+\sin ^{4} \theta+\lambda=0$ has real solutions for $\theta,$ then $\lambda$ lies in the interval
- [JEE MAIN 2020]
- A
$\left[-\frac{3}{2},-\frac{5}{4}\right]$
- B
$\left(-\frac{1}{2},-\frac{1}{4}\right]$
- C
$\left(-\frac{5}{4},-1\right)$
- D
$\left[-1,-\frac{1}{2}\right]$
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- [JEE MAIN 2019]
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