$\left(4.b^{-2}.c^{-3}\right)^2.\left(b.c\right)^6$

$sen\left(x+225\right)\:$

$10a^2b^3c^4-15a^5b^2c^4$

$\frac{dy}{dx}+\frac{5}{x}y=\frac{1}{x^5}$

$\left(x^{0.75}-1\right)\left(x^{0.75}+1\right)$

$\:\left(x\:+\:6\right)\left(x\:-\:5\right)\:+\:\left(x^2-\:5\right)\left(x^2+\:2\right)\:+\:x^2-\:x$

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