$73\:+\:491$

$\int\left(\frac{\sqrt{x}+\sqrt[3]{8x^4}-2x+\sqrt[4]{x}}{x}\right)dx$

$\lim_{x\to0}\left(\frac{x-arcsen\left(x\right)}{sen\left(x\right)cos\left(x\right)}\right)$

$\frac{dy}{dx}=y+x^2sinx$

$6b^6+21b^3$

$8+2n$

$\frac{1+cosec\left(u\right)}{sec\left(u\right)}-ctg\left(u\right)=cos\left(u\right)$