# Find all soultions

• Mar 10th 2010, 06:47 AM
purplec16
Find all soultions
$sin^2t-4sint+1=0$

Ok I know your suppose to subsitute it for x or u, but I cant seem to be able to solve that quadratic
• Mar 10th 2010, 07:38 AM
TKHunny
Are you saying that you cannot solve $x^{2}-4x+1 = 0$?

Are you sure you want to stay with that opinion? Give it one more try before you give up.
• Mar 10th 2010, 08:26 AM
HallsofIvy
You can't factor it with integer coefficients.

Complete the square or use the quadratic formula.