$f\left(x\right)=2\cos^2\left(x\right)+8cos\left(x\right)+1$

$\lim_{x\to\infty}\left(\left(\frac{\left(x+2020\right)}{x}\right)^x\right)$

$\frac{dy}{dx}\left(x^3y^2=ln\left(y\right)+e^{2x}\right)$

$\frac{sin\left(3x\right)}{sin\left(x\right)}-cos\left(3x\right)$

$3v+5-9$

$\frac{3.6742}{9}$

$3+3\tan^2\left(a\right)=\frac{3}{1-\sin^2\left(a\right)}$