$\frac{dy}{dx}=e^{6y+5x}$

$\lim_{x\to3}\left(\frac{\left(1-x\right)^7}{\left(2x-5\right)^4}\right)$

$\frac{\tan\left(8x\right)-\tan\left(7x\right)}{1+\tan\left(8x\right)\tan\left(7x\right)}$

$4a^2+15a+9$

$\left(x^2-2xz+z^2\right)\left(z^2+2zy+y^2\right)$

$16x^2-y^2$

$x-15=-34$