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Posted by on Sunday, February 19, 2012 at 12:16pm.

knowledge : point (-3,-4)is on the terminal arm of an angel (alpha) in stander position.verify that (sin alpha)2 + (cos alpha )2 =1

  • MATH - , Sunday, February 19, 2012 at 12:41pm

    FYI: angle, standard

    hypotenuse h = √(3^2+4^2) = √25 = 5

    sinθ = y/h = -4/5
    cosθ = x/h = -3/5

    sin^2θ + cos^2θ = (-3/5)^2 + (-4/5)^2 = 9/25 + 16/25 = 25/25 = 1

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