$\sin^2\alpha$\sin^2\alpha

$\sin^6\alpha \cdot \cos^2\alpha$\sin^6\alpha \cdot \cos^2\alpha

$\sin^4\alpha+1$\sin^4\alpha+1

$\sin^2\alpha \cdot (\sin\alpha+\cos\alpha) \cdot (\sin\alpha-\cos\alpha)$\sin^2\alpha \cdot (\sin\alpha+\cos\alpha) \cdot (\sin\alpha-\cos\alpha)