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OpenStudy (anonymous):
the terminal arm of an angle a lies in quadrant 4 . its reference angle theta satisfies the equation sin equal 3/14 what is cos a ?
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OpenStudy (psymon):
|dw:1379213497499:dw| So this is the triangle you have. I put down the (+,-) just to say that cosine is positive in that quadrant. Do you know what sides of a triangle cosine represent?
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