$\left(\sin\left(a\right)\right)^2\left(\csc\left(a\right)\right)^2+\left(\cos\left(a\right)\right)^2\left(\sec\left(a\right)\right)^2$

$16x\left(x\right)+8x+15$

$\frac{dy}{dx}=.8x\left(1-x\right)$

$\int\frac{x-4}{\left(2x+1\right)\left(x+3\right)}dx$

$x.\sqrt[4]{1+x^3}$

$-5+x\le1$

$f\left(x\right)=\frac{1}{\left(1+x\right)^2}$