$\frac{\left(1-sina\right)}{cosa}$

$3^x+3^{x+2}=30$

$x^2+y^2+y''=36+x+y''$

$-5\cdot\left|1\right|-3\cdot\left|1\right|^2+\left(7\left|-1\right|^2\left|1\right|^3\right)$

$\int\frac{2}{x^3\sqrt{x^2-9}}dx$

$\frac{df}{dx}=\frac{8}{x^5}+5\:3^x+5\cos\left(x\right)$

$6d^6\cdot8d^4$