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    trigonometric functions of quadrantal angles

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    Evaluate the following expressions involving quadrantal angles:

    1. sin180°cos180°- 3cos540°cos720° = ?

    © BrainMass Inc. brainmass.com October 9, 2019, 9:37 pm ad1c9bdddf
    https://brainmass.com/math/trigonometry/trigonometric-functions-quadrantal-angles-191788

    Solution Summary

    The solution shows how to evaluate the trigonometric functions of quadrantal angles.

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