$3x^2+14y-5=0$

$\cos\left(70\right)\cos\left(10\right)+\sin\left(70\right)\sin\left(10\right)$

$\left(+72\right)\cdot\left(-9\right)$

$\frac{b^{-4}}{b^{-5}}$

$m+n-2n+m-n+4m-6n+n-m-3m$

$10\left(r+1\right)=\frac{12}{r+1}-7$

$\lim_{x\to\infty}\left(\frac{17x}{17x+2}\right)^{9x}$