$5.0+0.40+3.75$

$\cos\left(30\right)\cdot\cos\left(20\right)+\sin\left(30\right)\cdot\sin\left(20\right)$

$\lim_{x\to0}\left(\frac{3-cos3x}{x^2}\right)$

$3-2x\le8+4x$

$\frac{d}{dx}\left(2\left(x^2+y^2\right)^2=25xy\right)$

$-2x^2+18-36$

$\log\left(6\right)=\log\left(2v\right)$