$4-8+5-\left(-2\right)-3-\left(5+3\right)$

$3x^4\:-\:4x^2\:+\:5x\:-\:10;\:x=3$

$\left(an\right)^3$

$\left(x^{2x}\right)^2$

$\frac{1+\sin\left(a\right)}{\cos\left(a\right)}+\frac{\cos\left(\:a\right)}{\sin\left(a\right)}=\frac{1\:\:+\sin\left(\:a\right)}{\sin\left(a\right)\cos\left(a\right)}$

$\sqrt{3}\sec x-2=0$

$\frac{1}{2}x^2y-\frac{2}{3}x^2\:y+\frac{3}{5}x^2y$