$\left\{\sin\left(x\right)\cdot\sin\left(y\right)=\frac{1}{4};\cos\left(x\right)\cdot\cos\left(y\right)=\frac{3}{4}\right\}$

$\frac{m^{20}-1}{m^2-1}$

$\left(4xy-2x^2\right)^3$

$q\left(x\right)=\sqrt{2mx^{3m-3}+3mx^{2m+2}}$

$\frac{6a^{4}b^{3}}{2a^{7}b^{3}}$

$9m+3m$

$2x\:-\:\left(x\:+\:4\right)-\:4y\:+z$