document.write( "Question 1011485: Cos120°=-1/2
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Algebra.Com's Answer #627129 by stanbon(75887) $\"\"$ $\"About$

You can put this solution on YOUR website!
Cos120°=-1/2
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\n" ); document.write( "Yes.
\n" ); document.write( "Reference angle is 180-120 = 60 Degrees
\n" ); document.write( "cos(60) = 1/2
\n" ); document.write( "But cos is negative in QII
\n" ); document.write( "So cos(120) = -1/2
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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