$\:\left(1+tan^2x\right)cotx=secx\:cscx$
$\frac{x^4+8x^2+16}{x^2+4}$
$x^{5}+3x^{4}-2x^{3}+6x^{2}-3x+4y-\left(x^{5}+3y+4\right)$
$2x+y-z=20$
$8y^2-16$
$\int\left(y^2e^3\right)dy$
$\left(3x+5t^2\right)^2$
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