$4x-3x+y$

$\left(3x-8\right)+\left(2x+5\right)-\left(4x-8\right)$

$cosa\left(tana+cota\right)=csca$

$y\frac{dy}{dx}+xy^2=2x$

$-693+42$

$\left(5xy\:+\:4\right)\:\left(\:25x^2y^2\:-\:20xy\:+\:16\right)$

$\frac{\csc\left(x\right)}{\cos^2\left(x\right)}=\sec\left(x\right)\left(\tan\left(x\right)+\cot\left(x\right)\right)$