$\frac{\sin\left(x\right)^2}{\cos\left(x\right)^2}+\frac{\cos\left(x\right)^2}{\sin\left(x\right)^2}+2$

$\left[2-\left(5+3\right)\right]-\left[6-\left(1-4\right)\right]$

$2x^2-15x+25\:\:x-5$

$\int\left(x^2+3x\right)\left(2x+3\right)dx$

$\left(5+4h\right)^2$

$9x+4=49$

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