Math(Please check!!!)

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1) Evaluate (if possible) the sine, cosine, and tangent of the angles without a calculator.

a) 10pi/3

Sin = -sqrt 3/2
Cos = -1/2
Tan = sqrt 3

Are these correct ? I do not understand when to make them negative.

b) 17pi/3

Sin = -sqrt 3/2
Cos = 1/2
Tan = - sqrt 3

Are these correct?

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