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Math Help - exam on monday need help (trignomentary problem)

  1. #1
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    exam on monday need help (trignomentary problem)

    4 sin(90 + φ) = 10 sin(150 φ) equation 1
    tanφ = 4 √3 equation 2
    can anyone tell me how equation 1 is solved to get equation 2
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  2. #2
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    Re: exam on monday need help (trignomentary problem)

    Start with the identity sin(A+B) = sinAcosB+cosAsinB. See if that helps you to make progress.
    Thanks from topsquark
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