$10x+4y-y$

$\frac{64x^{6}-343y^{9}}{4x^{2}-7y^{9}}$

$\lim_{h\to0}\left(\frac{\left(x^2-3x+h\right)-\left(x^2-3x\right)}{h}\right)$

$\lim_{x\to1}\left(\frac{-2x}{\cos\left(\pi x\right)\cdot\pi}\right)$

$-2x^2=7x-15$

$\frac{\left(\cos^2x\right)dy}{\left(\sin\left(x\right)\right)}=\frac{ydx}{\cos^2\left(x\right)}$

$\frac{1-2-2-3}{-2}$