$\left(\left(\left(2\right)^{\left(-8\right)}\:\right)^{\left(-3\right)}\right)^{\left(-7\right)}$

$3x^2-6x-10$

$\left(-75+42\right):\:\left(-16\:+5\right)\:-15$

$2xy\:+\:2x$

$\frac{\sin^3\left(x\right)+\sin\left(x\right)\cos^2\left(x\right)}{\cos\left(x\right)}=\tan\left(x\right)$

$\int x\cdot10^xdx$

$9 a = 81$