exam Maths Puzzle Numerical Ability

sqrt4(sqrt32+3sqrt8)

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I need to solve the equation cos^2(theta) = 4sin(theta)+4, on the interval 0<(theta)<2pi. I thought I had simplified it correctly using trig identities, but something went wrong. Thanks! I am currently studying for a test that I have on friday of the up coming week. I have been studying unit 3 for the past 3 days and I can't seem to figure out the right answer for