$h\left(x\right)=\tan\left(\arccos\left(\frac{x-1}{x+2}\right)\right)$

$3x^5-8+2+42x^5-4x-2$

$\frac{dy}{dx}=\left(y+1\right)\left(y-10\right)$

$7a^2b^2c\left(2a^2+4ac^3\right)$

$\cos x\left(1-\cos^2x\right)=\sin x$

$\lim_{x\to-1}\frac{1}{x}-\frac{1}{\left|x\right|}$

$\left(\csc\:\left(a\right)-\sin\left(a\right)\right).\left(\sec\left(a\right)-\cos\left(a\right)\right)$