document.write( "Question 873030: Use an Addition or Subtraction Formula to find the exact value of the expression.
\n" ); document.write( "cos 195°
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Algebra.Com's Answer #526636 by stanbon(75887)\"\" \"About 
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Use an Addition or Subtraction Formula to find the exact value of the expression.
\n" ); document.write( "cos 195°
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\n" ); document.write( "cos(195) = -cos(15) = -cos(30/2)
\n" ); document.write( "Use the half-angle formula to solve.
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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