$\int\left(\frac{1}{4\cdot\sin\left(x\right)^3}\right)$

$\frac{dx}{dy}=2+2x+y+xy$

$2sin\left(2x\right)\left(1-2sin^2x\right)=sin\left(4x\right)$

$\lim_{x\to\infty}\left(\frac{3^x}{3^x-2^x}\right)$

$4ax+ab$

$\frac{1}{a}\int\frac{4x}{a+x^2}dx$

$x^2+y^2+z^2-xy-xz\:\:por\:\:x\:+y+z$