$\frac{\sin\left(b\right)}{\cos\left(b\right)}+\frac{\cos\left(b\right)}{\sin\left(b\right)}=\frac{\csc\left(b\right)}{\cos\left(b\right)}$

$\left(y+2r\right)^3$

$18bm\:+\:9bx\:+\:3b$

$-2\left(-4\right)^3$

$2ydy=\left(x^2+1\right)dx$

$\int\frac{7x}{\left(2x+1\right)\left(x-3\right)}dx$

$a.10x\:+\:3y\:+\:4x\:+\:5y$