$\lim_{x\to0}\left(\frac{\ln\left(1+x\right)^{\left(1+x\right)}}{x^2}-\frac{1}{x}\right)$

$2x+y;\:x=7;\:y=10g$

$3\left(-6x+12\right)-8$

$\frac{11u^4}{17u^7u^9}$

$\int\left(y^3+y\right)dy$

$14u-11u+u-4u+4u=20$

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