$\frac{7+5\sin^2\left(x\right)-\cos2\left(x\right)}{3\sin^2\left(x\right)+2\cos^2\left(x\right)-1}$

$\frac{\ln\left(0.87\right)}{-0.00012}$

$x^2-30x+10$

$\left(5xy^3\right)\left(-2x^5y^3\right)$

$\frac{d}{dx}7cosx$

$\frac{\left(x^2+x-8\right)}{x^2-8}$

$4x-3a+2y-5x+x+3a-y-y$