$\arctan\left(0.6514\right)$

$\left(ab+7b\right)^2$

$\left(\left(x^4\right)^2\right)^3$

$\int\:e^{3x+5}x\:dx$

$\left(64f^6g^{-3}\right)^{\frac{1}{1}}\:x\:\left(81f^{-4}g^8\right)^{\frac{1}{2}}$

$\lim_{x\to0}\left(\frac{2sin\left(x\right)-2x}{xsin\left(x\right)}\right)$

$\left(11x-13\right)\left(121x^2-143xy+169y^2\right)$