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use the unit circle to find the exact value for all the trig functions of è=2ð/3.

  • trig -

    I do not understand your notation, è=2ð/3.

    Do you mean theta = 2 pi/3?

    The sine of 2 pi/3 is the same as the sine of pi/3, which is (sqrt3)/2

    The cosine of 2 pi/3 has the same absolute value as cos pi/3 (1/2), but has opposite sign

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