$\int\left(\frac{sin\left(2t+4\right)}{cos^2\left(2t+4\right)}\right)dt$

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

$\left(-5\right)\:.-6\left(+13\right).-6$

$78-\left(-13\right)$

$\left(0.1xy^4+\frac{10}{3}z^3\right)^2$

$w=x^2\cdot y^2$

$\left(-\sqrt{x-1}+5\right)^2$