$\frac{cos\left(x\right)-cos\left(y\right)}{sin\left(x\right)+sin\left(y\right)}+\frac{sin\left(x\right)-sin\left(y\right)}{cos\left(x\right)+cos\left(y\right)}$

$\frac{6x^3-10x^2}{2a}\:$

$\lim_{x\to\infty}\left(\frac{5}{6}\right)^x$

$4x-8xy$

$76.7\cdot308.2$

$\frac{dy}{dx}=\frac{e^{2x}-5}{e^{2x+7y}}$

$\left(x-100\right)^2$