JEE Main 2021 (18 Mar, Shift 1) Maths Q79: Determinants

Question

The solutions of the equation
$\begin{vmatrix}1+\sin^2x & \sin^2x & \sin^2x\ \cos^2x & 1+\cos^2x & \cos^2x\ 4\sin2x & 4\sin2x & 1+4\sin2x\end{vmatrix}=0$, $(0<x<\pi)$, are :

Accepted Answer

Option 3: $\frac{7\pi}{12},\frac{11\pi}{12}$

Answer

$\frac{\pi}{6},\frac{5\pi}{6}$

Answer

$\frac{5\pi}{12},\frac{7\pi}{12}$

Answer

$\frac{7\pi}{12},\frac{11\pi}{12}$

Answer

$\frac{\pi}{12},\frac{\pi}{6}$

JEE Main 18 March 2021, Shift 1, Maths Q79