Question 186607
Simplify:
{{{((x^4-1)/(x^4-81))*((x^2+9)/(x^2+1))}}} Factor the numerator and the denominator of the left-most fraction.
{{{((cross(x^2+1))(x^2-1)/(cross(x^2+9))(x^2-9))*((cross(x^2+9))/(cross(x^2+1)))}}} Cancel the indicated factors.
{{{highlight((x^2-1)/(x^2-9))}}}