$546-78$

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

$\int\frac{x^3-7x^2+17x-17}{x^2-5x+6}dx$

$x^2-20x-25$

$\frac{\left(a+x\right)^2\left(b+y\right)^2}{\left(a+y\right)^2-\left(b+x\right)^2}$

$\left(\frac{4y^4}{7y}\right)^2$

$c^2-4$