$sec^2x-csc^2x=\left(tanx+cotx\right)$

$\frac{5x}{2x+6}+\frac{x-3}{x+3}$

$f\left(x\right)=ln\left(\frac{2x^4\cdot\sqrt[7]{x^{10}}}{7^4\sqrt{x^9}}\right)$

$\lim_{x\to\pi}\left(5\sin\left(x\right)^2\right)$

$\left(mn+8a\right)^2$

$2\cdot\left(8-15\cdot2\right)$

$\frac{dv}{dt}=0.03v\sqrt{t}$