$\lim_{x\to0}\left(+\right)\left(\frac{\ln\left(x\right)}{\cot\left(x\right)}\right)$

$ln\left(x^7-1\right)-ln\left(x^5-1\right)$

$-4-\left(5-7\right)-\left(4+55\right)$

$f\left(z\right)=3z-5z$

$e-1.4$

$2-3\cdot\left(-5\right)^2$

$\int\left(\left(2x+5\right)\left(x^2+5x+7\right)^6\right)dx$