$x-2+2x+5$

$\int\frac{x^2-x+1}{x^2\left(x^2+x\right)}dx$

$\sqrt{3}cos\left(x\right)-cos\left(x\right)$

$\lim_{x\to0}\left(\frac{\tan\left(7x\right)}{\tan\left(3t\right)}\right)$

$\left(x^2-6\right)+\left(3x+5\right)$

$sin2x=\frac{2\left(\tan\left(x\right)-\cot\left(x\right)\right)}{tan^2\left(x\right)-cot^2\left(x\right)}$

$\frac{dy}{dx}=\frac{x}{y}\:\:;\:y\left(1\right)=2$