$17\cdot\left(-42\right)$

$\int_{1}^{3}7xdx$

$\frac{x^2-2}{x-1}$

$66:\left(15-9\right)+7x\left(6:2\right)-12:2$

$\frac{1}{2}-\frac{7}{9x}=\frac{4}{9}-\frac{1}{6x}$

$\left(2xa^3-b^2\right)^5$

$4\sin\left(x\right)^2+2\sqrt{3}\sin\left(x\right)-2\sqrt{2}\sin\left(x\right)-\sqrt{6}$