$3x-5\:si\:x=-1$

$6,37+5,45$

$\frac{sin\left(x\right)}{1-cos\left(x\right)}=\frac{1}{sin\left(x\right)}+\frac{1}{tan\left(x\right)}$

$\frac{\left(2\cdot3\right)^3}{\left(5^2\right)\cdot2^3\cdot\left(3\cdot2^2\right)^2}\cdot\left(2^2\cdot5\right)^2\cdot5^3$

$4a^3b-2a^2b^2-1.1ab^3$

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

$log\frac{16}{x}$