$4\frac{14}{31}+6\frac{2}{62}$

$\cot\left(x\right)=\frac{1+\sin\left(2x\right)+\cos\left(2x\right)}{1+\sin\left(2x\right)-\cos\left(2x\right)}$

$x'=-x+2\cdot e^t$

$z=ln\left(x^2+y^2-9\right)$

$4x^5-12x^2+13x^3+12x^2-x+1\left(1-3x+2x^2\right)$

$3x^2-3xy;\:x=5\:y=-2\:$

$\int\frac{x}{2x^2+2}dx$