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Math Help - Finding exact values of trignometric functions

  1. #1
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    Finding exact values of trignometric functions

    How do I find the exact values of trigonometric functions like sin 120 and cos 120?
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  2. #2
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    \sin 120 = \sin (180-60) = \sin 60 = \dots...

    \cos 120 = \cos (180-60) = -\cos 60 = \dots...

    what do you think?
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