document.write( "Question 929091: Solve the equation. (Use n as an integer constant. Enter your response in radians.)\r
\n" ); document.write( "\n" ); document.write( " 100 cos2 x − 25 = 0 \n" ); document.write( "

Algebra.Com's Answer #564290 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
This is the difference of two squares.
\n" ); document.write( " $\"100cos%5E2%28x%29-25=0\"$
\n" ); document.write( " $\"%2810cos%28x%29-5%29%2810cos%28x%29%2B5%29=0\"$
\n" ); document.write( "Two solutions:
\n" ); document.write( " $\"10cos%28x%29-5=0\"$
\n" ); document.write( " $\"10cos%28x%29=5\"$
\n" ); document.write( " $\"cos%28x%29=1%2F2\"$
\n" ); document.write( " $\"x=pi%2F3\"$ and $\"x=%285%2F3%29pi\"$
\n" ); document.write( "and
\n" ); document.write( " $\"10cos%28x%29%2B5=0\"$
\n" ); document.write( " $\"10cos%28x%29=-5\"$
\n" ); document.write( " $\"cos%28x%29=-1%2F2\"$
\n" ); document.write( " $\"x=%282%2F3%29pi\"$ and $\"x=%284%2F3%29pi\"$
\n" ); document.write( " \n" ); document.write( "

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