$6^6\:+6^{-2}$

$3m-2n-2nx^4+3m+4$

$\cos\left(-\frac{5}{3}\right)\cdot\cos\left(\frac{4}{5}\right)-\sin\left(-\frac{5}{3}\right)\cdot\sin\left(\frac{4}{5}\right)$

$\left(x+y\left(3+x\right)\right)^2$

$\left(4x^{3}+3x^{2}y^{3}\right)dx+3x^{3}y^{2}dy=0$

$\left(a-15\right)\left(a-10\right)$

$3a-4b-\left(a-2a-3b-5-5a-b\right)$