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Determine whether each of the following expressions is Positive or Negative without using a calculator.

$\sin(70^\circ)$
A. Negative
B. Positive

$\cos(138^\circ)$
A. Negative
B. Positive

$\sin(\frac{15\pi}{16})$
A. Positive
B. Negative

$\cos(\frac{20\pi}{21})$
A. Negative
B. Positive

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