$17.2x^2+6x+8x^3-12x^4$

$\sqrt{x^2+\left(x+y\right)^2}$

$\frac{4x^3+10x^2-6x+9}{2x+1}$

$\left(u^0v^{-3}\right)^{12}$

$\frac{1}{2}\left(2t+5\right)^{-\frac{1}{2}}$

$\left(4a^{-2-\left(-2\right)}b^{-4-\left(-3\right)}\right)^{-2}$

$sin\left(x-y\right)cos\left(y\right)+cos\left(x-y\right)sin\left(y\right)=sin\left(x\right)$