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March 29, 2017

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Calculate the exact values of sin(theta) cos(theta) and tan (theta) when theta=240 degrees.
How would I do this with and without a calculator?

  • Calc - ,

    Learn your standard angles in their various orientation around the circle.

    0 pi/6 pi/4 pi/3 and pi/2 are important enough to memorize
    In degrees, that's 0 30 45 60 90

    240 = 180 + 60
    so it's in the 3rd quadrant.
    Use the functions of 60 degrees, except that sin and cos are both negative there.

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