$y'-4y=0.8$

$2x+1<3x-1$

$\left(x+5\right)-\left(ax-1\right)=2x+b$

$3x^2-2\cdot3x^2+2$

$\cos\left(x\right)\csc\left(x\right)\cos\left(x\right)\left(\frac{1}{\cos\left(x\right)}\right)=\cot\left(x\right)+1$

$\lim_{x\to2}\left(\frac{x^2-3x+2}{x^2+x-1}\right)$

$\int\ln\left(\cos\left(bx\right)\right)\left(\tan\left(bx\right)\right)dx$