$\left(7g-1\right)\left(7g+1\right)$

$\left(5x-y\right)^2\left(5x+y\right)^2\left(25x^2+y^2\right)$

$\int\left(3x^2+1\right)cos\left(3x\right)dx$

$-4n+\left(-2\right)+2n+3$

$25-4\cdot5-12$

$\sqrt[4]{1+\left(x-1\right)\left(x+1\right)\left(x^2+1\right)\left(x^4+1\right)}$

$x\:y\:dy=\left(y+1\right)\left(1-x\right)dx$