$2\left(1+\cos\left(x\right)\right)-\left(1+\cos\left(x\right)\right)^2=\sin\left(x\right)^2$

$\int\left(x^3+2x\right)\left(6x^2+4\right)dx$

$y=x^2\left(x-1\right)^3\:\:;\:x=2$

$x^2-14kx+49k^2$

$\:3z+2+\left(-5z\right)$

$\lim_{x\to\infty}\left(x^3\ln\left(x\sin\left(\frac{1}{x}\right)\right)\right)$

$\sqrt{a^2+a^4}$