c. A negative cosine and a negative sine.
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d. A cosine of about −0.9 and a sine of about 0.4.
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e. Could an angle have a sine equal to 0.9 and cosine equal to 0.8? Give an angle or explain why not.
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HINT: Given a particular angle in the unit circle, the height and base lengths shown indicated at right. Drag the slider below to change the angle.
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0
360
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