$\lim_{x\to3}\left(\frac{x}{3}\right)^{\frac{1}{3-x}}$

$-5.8-2.1$

$4\ln\left(\cos x\right)$

$\int_0^{\frac{\pi}{2}}\left(2e^{sin\left(x\right)}cos\left(x\right)\right)dx$

$\left(-48\right)\::6$

$\frac{1}{\tan\left(x^2\right)}$

$\int\frac{\left(3z+7\right)}{\left(z+1\right)\left(z+2\right)\left(z+3\right)}dz$