$12-28x+\frac{15}{6x-5}$

$\int_0^a\left(\frac{1}{\sqrt{x^2+y^2}}\right)dx$

$-2y\int\left(e^{-2x}\right)dx$

$5.\:\left(-2\right)+\left(+4\right).\left(-3\right)-\left(-12\right):\left(-2\right)$

$\frac{\csc z}{\csc z-\sin z}=\sec^2z$

$s\left(5\right)=3sin\left(3\left(5\right)\right)$

$\frac{4x^3+12x^2+12x+4}{x^2-2}$