trig maths
posted by inno .
rewrite 7 sin2A – 5 sin A + cos2A = o to solve for A

Been messing around with this for a while but it has me stumped.
I did get a couple of answers using a trusty on  line equation solver, but I just can't get the expression simplified.
If it helps at all
A = 1.1492098 and A = 3.089173 radians