$x^2-28x+196=0$

$11\left(2x+1\right)\left(4x^{2}+7\right)$

$2sin^2\left(\pi\right)-sin\left(\pi\right)=0$

$x+1.2x$

$\sqrt[4]{\left(x+y\right)^3}.\sqrt[12]{\left(x+y\right)^{-1}}.\sqrt[3]{\left(x+y\right)^4}$

$\int\frac{2x-1}{x\left(4x+1\right)}dx$

$\cos\left(x\right).\sin\left(x\right).\sec\left(x\right)=1$