$4x^3-2x^2+2x-1\::\:2x+1$

$\left(59\right)-\left(-37\right)$

$\left(2.5a+3e\right)\left(2.5a-3e\right)$

$\int\left(sin^7x-4sin^2x-sinx\right)cosx\:dx$

$34-\left(25+3\right)+\left[\left(63+5\right)-\left(43-18\right)\right]-\left(23-4\right)$

$\lim_{x\to0}\left(\frac{\cos\left(x\right)-\cos\left(3x\right)+x^3\cos\left(\frac{\pi}{x}\right)}{x^2}\right)$

$a^2-8a+15$