Question 767413
factor the trigonometric expression 
64 sec^2y - 16 sec y + 1
Use quadratic formula to solve for sec(y)
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
a=64, b=-16, c=1
ans:
(sec(y)-1/8)(sec(y)-1/8)