$\lim_{x\to1}\left(\frac{1-x-\ln\left(x\right)}{x+\cos\left(\pi x\right)}\right)$

$2-2sin\left(x+15\right)=3$

$\int\left(\frac{x^2}{\sqrt{a^2}+\sqrt{b^2}}-\frac{3x}{\sqrt{a}}-5\sqrt{b}\right)\:dx$

$\left(2a^3-5a^2+4a-1\right)+\left(a-1\right)$

$2\cdot5^{x-4}+15=265$

$x^2-11x+42$

$\left(6n^{-1}\right)^3$