document.write( "Question 401136: Express the function f(x)=5cos(2x)°-3sin(2x)° in the form f(x)=kcos(2x-α)°,
\n" ); document.write( "where k>0 and 0≤α≤360 \n" ); document.write( "

Algebra.Com's Answer #284002 by robertb(5830) $\"\"$ $\"About$

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\n" ); document.write( "Let $\"cos%28alpha%29+=+5%2Fsqrt%2834%29\"$ and $\"sin%28alpha%29+=+-3%2Fsqrt%2834%29\"$ , where
\n" ); document.write( " $\"alpha+\"$ is in the 4th quadrant.
\n" ); document.write( "Then
\n" ); document.write( " $\"5cos+%282x%29+-+3sin%282x%29+=+sqrt%2834%29%2Acos%282x+-+alpha%29\"$ \n" ); document.write( "

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