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if 5cosa + 3 = 0 and 180<a<360 , find the value of 3tana + 25sin^2a

  • math,science -

    cosa = -0.6
    a = 126.87 degrees or 233.13 degrees

    Your requirement that 180<a<360 degrees requires you to pick the second value for a.

    Now calculate 3tana + 25sin^2a
    I get 4 + 16 = 20.

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