$\sqrt{5.76}+\sqrt{1.44}$

$y:\frac{\left(\tan\theta+1\right)\left(\tan\theta+1\right)-\sec^2\theta}{\tan\theta}$

$4xy\:+\:5x^3\:y\:-\:2y^4;\:\:\:si:\:x=1\:;\:y\:=\:-2$

$\frac{3x^4-6x^2-x}{x}$

$\lim_{x\to0}\left(\frac{x^2}{1-\cos\left(x\right)}\right)$

$8-4\cdot5+3$

$7-3.\left(-4\right)-\frac{27}{\left(-9\right)}$