document.write( "Question 936570: The letters x and y represent rectangular coordinates. Write the following equation using polar coordinates (r, θ).
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Algebra.Com's Answer #570018 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "The polar substitutions are:\r\n" );
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document.write( "\"x%2Fr=cos%28theta%29\" -> \"x=r%2Acos%28theta%29\"\r\n" );
document.write( "\"y%2Fr=sin%28theta%29\" -> \"y=r%2Asin%28theta%29\"\r\n" );
document.write( "\"r%5E2=x%5E2%2By%5E2\"    -> \"r=sqrt%28x%5E2%2By%5E2%29\"\r\n" );
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document.write( "\"y=x\"\r\n" );
document.write( "\"r%2Asin%28theta%29=r%2Acos%28theta%29\"\r\n" );
document.write( "divide both sides by \"r%2Acos%28theta%29\"\r\n" );
document.write( "\"sin%28theta%29%2Fcos%28theta%29=1\"\r\n" );
document.write( "\"tan%28theta%29=1\"\r\n" );
document.write( "\"theta=pi%2F4\"\r\n" );
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document.write( "Edwin
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