$\int\frac{sin\left(ln\:23x\right)}{x}\:dx$

$\frac{x^4-5x^3+x^2+5x-2}{x+1}$

$0.01x^2\:+x-600$

$\frac{dy}{dx}=\frac{2y\cos\left(x\right)+\sin^4\left(x\right)}{\sin\left(x\right)}$

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

$\frac{2}{3}x>7$

$y=x^3-sem\left(x\right);\:y\left(1\right)=5$