$\left(1-\cos\left(x\right)\right)\cdot\left(1+\sec\left(x\right)\right)\cdot\left(\cos\left(x\right)\right)$

$49x^4+14x^2y+y^2$

$\infty e\left(\infty\right)$

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

$4^{2\left(2c+3\right)}$

$\left(\frac{x}{x^2-x-6}\right)$

$\int6x^5e^{8x^6}dx$