document.write( "Question 1068900: please help me (cos x-1)(cos x+1)＝0\r
\n" ); document.write( "\n" ); document.write( "Poblem # 2 sen t cos t-cos t=0 problem 3 tan²x +tanx=0 problem# 4 sen²x-2senx+1=0 problem #5 sen 4x cos x=sen x cos 4x \n" ); document.write( "
Algebra.Com's Answer #684149 by stanbon(75887)\"\" \"About 
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please help me (cos x-1)(cos x+1)＝0
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\n" ); document.write( "Poblem # 2 sin t cos t-cos t=0
\n" ); document.write( "cos(t)(sin(t)-1) = 0
\n" ); document.write( "cos(t) = 0 or sin(t) = 1
\n" ); document.write( "t = 90 degrees
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\n" ); document.write( "problem 3 tan²x +tanx=0
\n" ); document.write( "tan(x)(3tan(x)-1) = 0
\n" ); document.write( "tan(x) = 0 or tan(x) = 1/3
\n" ); document.write( "x = 0 degrees or x = arctan(1/3) = 18.43 degrees
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\n" ); document.write( "problem# 4 sen²x-2senx+1=0
\n" ); document.write( "(sin(x)-1)^2 = 0
\n" ); document.write( "sin(x) = 1
\n" ); document.write( "x = 90 degrees
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\n" ); document.write( "problem #5 sen 4x cos x=sen x cos 4x
\n" ); document.write( "tan(4x) = tan(x)
\n" ); document.write( "x = 60 degrees
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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