$\left(-8\right).\left(+4\right):\left(-2\right)$

$-5t+13t$

$\log_x\left(4\right)=16$

$\frac{\left(\sin\left(x\right)\right)^2}{\left(\cos\left(x\right)\right)^3}$

$2a^2-b;\:a=-2;\:b=4$

$\frac{\sqrt{-3\left(x+1\right)\left(x+5\right)}}{4x^2-9}$

$\int_1^e\left(\frac{1}{\ln\left(x\right)}\right)dx$