Question

помогите плиизз!!!!!!​

Answer 1

$a)\;\sin^4\alpha+\sin^2\alpha\cos^2\alpha+\cos^2\alpha=\sin^2\alpha(\sin^2\alpha+\cos^2\alpha)+\cos^2\alpha=\\=\sin^2\alpha+\cos^2\alpha=1\\\\b)\;\sin^4\alpha+2\sin^2\alpha\cos^2\alpha+\cos^4\alpha=(\sin^2\alpha+\cos^2\alpha)^2=1^2=1$