$p\left(x\right)=5x\frac{2}{a-3}+4x\frac{3}{a}$

$LaTeX:\:\frac{\sin^2\theta\csc\theta\sec\theta}{\tan\theta}$

$\int sin\:\left(3x+9\right)\:dx$

$18mx-6mx+54nx-18ny$

$\int\:\frac{3}{5}\cdot\:\:e^{5x-3}dx$

$\csc\left(x\right)\cot\left(x\right)=\csc\left(x\right)$

$25m^2+20mn+m^2$