$\frac{x^2}{x}senxdx+y\frac{x}{x}dy=0$

$3a^2;\:a=1,7$

$\frac{\left(1+cosx\right)}{\left(1+secs\right)}$

$\int\arcsin\left(2w\right)dw$

$+35-46-\frac{65}{\left(-5\right)}$

$\left(-21\right)-\left(-30\right)+\left(-7\right)$

$\int_{-1}^{-5}\frac{1}{x\left(x-2\right)\left(x-3\right)}dx$