trig maths

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rewrite 7 sin2A – 5 sin A + cos2A = o to solve for A

  • trig maths -

    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

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