Question

Нужно доказать тождество

Answer 1

I hope this helps you

Answer 2

$2 + frac{sin^4x+cos^4x}{sin^2xcos^2x} = frac1{sin^2xcos^2x}\2 + frac{sin^4x+cos^4x}{sin^2xcos^2x} = frac{sin^4x+2sin^2xcos^2x+cos^4x}{sin^2xcos^2x} = frac{(sin^2x+cos^2x)^2}{sin^2xcos^2x} = frac1{sin^2xcos^2x}$