Mathematics - Determinant Question with Solution | TestHub

$\begin{array}{rl}& C_3\to C_3-C_1\\ & y(x)=\left|\begin{array}{ccc}\sin x& \cos x& 1+\cos x\\ 27& 28& 0\\ 1& 1& 0\end{array}\right|\\ & y(x)=-(1+\cos x)\\ & \frac{dy}{dx}=\sin x\\ & \frac{d^{2}y}{d{x}^2}=\cos x\\ & \frac{d^{2}y}{d{x}^2}+y=-1\end{array}$