$3.\:\left(x-2\right)\:<\:4x\:+1$

$sec\left(x\right)csc\left(x\right)\left(tan+\cot\left(x\right)\right)=sec^2\left(x\right)csc^2\left(x\right)$

$\int\left(\frac{sec^2\left(x\right)}{tan^3\left(x\right)}\right)dx$

$20\cdot8$

$\frac{-1,75x+0,5}{x\left(-x+2\right)}$

$\int_0^2\left(x^2ln\left(6x\right)\right)dx$

$41xy+2xy-6-8xy+13$