$\left(3d^2-7c^3\right)^2$

$x^2y^3+15x^3y^3-8x^3y^3+13x^2y^3$

$\left(10m^2-7n^3\right)\left(10m^2+7n^3\right)$

$\frac{2}{\left(1-sina\right)\left(1+sina\right)}$

$-10\left(9+-7x\right)+-6$

$\frac{b^{56}c^0d^5}{b^{59}c^{-2}d^{-1}\cdot\:\:\:b^0c^{-1}d^{-98}}$

$\left(-2ab^2\right)^5$