$\left(-5\right)\left(4\right)\left(-10\right)+5\left(-4\right)\left(6\right)-2+\left(-5\right)$

$n^2+n+42$

$\left(\cos x+i\text{senx}\right)^2$

$12sin^2x+\sin\left(x\right)-1=0$

$\frac{36x^4-109x^2+25}{x-3}$

$\frac{\left(20-5^2\right)\left(16+2^2\right)}{-2^3+\left(3\cdot2^2\right)}$

$\frac{y^2}{y-3}\cdot\frac{-1}{\left(y+2\right)}$