4. Show that the matrix $$A = \begin{bmatrix} 2\sin^2 \alpha & 2\sin^2 \beta & 2\sin^2 \gamma \\ 3\cos^2 \alpha & 3\cos^2 \beta & 3\cos^2 \gamma \\ 1 & 1 & 1 \end{bmatrix}$$ is not invertible for any value $$\alpha, \beta, \gamma$$.

阿摩線上測驗 · 2026-10-22T13:57:49+08:00

4. Show that the matrix A = bmatrix 2^2 α & 2^2 β & 2^2 γ \ 3^2 α & 3^2 β & 3^2 γ \ 1 & 1 & 1 bmatrix is not invertible for any value α, β, γ.