$\frac{d}{dx}3cos\frac{1}{x}$

$80m^2+64m^4+64m^3+32m+16-128m^3-16m^2-128m-16$

$( - 50 ) + x = ( - 30 )$

$\left(1^n\right)\frac{n+4}{n^2}$

$\left(-r^{2\:}-2r+3\right)\left(-r^{2\:}-3r+2\right)$

$\left(-xy^2+2y\right)dx+\left(-x^2y+2x\right)dy=0$

$\left(7a^2+7a+7\right)^2$