document.write( "Question 401631: Solve equation for all value of ø if ø measure in degrees
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\n" ); document.write( "cos^2ø -5/2cosø -3/2=0
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Algebra.Com's Answer #284287 by stanbon(75887)\"\" \"About 
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Solve equation for all value of ø if ø measure in degrees
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\n" ); document.write( "cos^2ø -(5/2)cosø -3/2 = 0
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\n" ); document.write( "Multiply thru by 2 to get:
\n" ); document.write( "2cos^2 - 5cos - 3 = 0
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\n" ); document.write( "Factor:
\n" ); document.write( "2cos^2-6cos+cos-3 = 0
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\n" ); document.write( "2cos(cos-3)+ (cos-3) = 0
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\n" ); document.write( "(cos-3)(2cos+1) = 0
\n" ); document.write( "cos(theta) = 3 or cos(theta) = -1/2
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\n" ); document.write( "cos= 3 is an extraneous solution.
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\n" ); document.write( "Solve cos(theta) = -1/2
\n" ); document.write( "theta = 120 degrees or theta = 240 degrees
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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