document.write( "Question 1112525: 9 cos x + 5 = −cos x \n" ); document.write( "

Algebra.Com's Answer #727586 by stanbon(75887) $\"\"$ $\"About$

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9 cos x + 5 = −cos x
\n" ); document.write( "10cos(x) = -5
\n" ); document.write( "cos(x) = -1/2
\n" ); document.write( "----
\n" ); document.write( "x = arccos(-1/2) = 2pi/3
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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