$\left(1+3x+\frac{5}{x}\right)\left(1-12x+60x^2-160x^3\right)$

$\frac{x+6}{4x^2}+\frac{3}{2x^2}=\frac{x+2}{2x^2}$

$sin^2x=\frac{sec^2x-1}{1+tan^2x}$

$\left(2-x\right)\left(4-y\right)$

$\int x\arccot\left(2x\right)dx$

$f\left(x\right)=\left(5x^3-x^4\right)^7$

$b^2+2a\sqrt{c};\:a=5;\:b=7;\:c=9$