$\csc\left(x\right)\csc\left(y\right)\sin\left(x+y\right)$

$49x^2-36x^2$

$\frac{1}{1-sin^2\left(y\right)}=1+tan^2y$

$\frac{\left(x\right)}{\left(5\cdot\left(x+3\right)\right)}-\frac{1}{7}$

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

$\int x^5e^{15x}dx$

$9\:-\:8\left(-3x\:+\:7\right)$