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Math · Trigonometry
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Use the cosine of a sum and cosine of a difference identities to find cosine left parenthesis s plus t right parenthesis and cosine left parenthesis s minus t right parenthesis.

sine s equals negative StartFraction 12 Over 13 EndFraction and sine t equals three fifths ​, s in quadrant III and t in quadrant Upper I

cos(s+t) =

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