$_{\left(x-y\right)}dx\:+x\:dy=0$

$\lim_{x\to0}\:\left(\frac{1}{x}\right)ln\left(\frac{3x+2}{x+2}\right)$

$20-\left(-4\right)$

$2\log\left(2\right)-\log\left(x-5\right)=\log\left(x-8\right)$

$\lim\:_{x\to\:\frac{\pi\:}{2}}\left(\frac{1+cosx-sinx}{sinx+cosx-1\:}\right)$

$\int x^2\:sen\:\left(x^3\:+5\right)cos^9\left(x^3+5\right)dx$

$3a\cdot a$