$-4+17+8+7$

$\frac{5x^4-18x^3+45x}{9x}$

$y=\frac{x^2sin\left(x\right)}{\left(x^2+4x+1\right)^5}$

$\left(-11\right)-3\cdot\left(-4\right):\left(-6\right)-\left(-9\right)$

$\frac{\sin\left(8x\right)\:}{1}$

$xsenx^2=x^4$

$\lim_{x\to0}\left(\frac{5\sin\left(x\right)^2}{1+\cos\left(x\right)}\right)$