document.write( "Question 360872: I need help proving the following trigonometric identity. I can't seem to get the proof correct and can't figure out what I'm doing wrong. I am trying to use the basic laws of sine and cosine to prove this identity but it doesn't seem to work. Thanks for your help!\r
\n" ); document.write( "\n" ); document.write( "Here's the identity:\r
\n" ); document.write( "\n" ); document.write( "\"sin%28theta%29%2F%281-cos%28theta%29%29\"\"%22%22-%22%22\"\"%0D%0A%281%2Bcos%28theta%29%29%2Fsin%28theta%29\"\"%22%22=%22%22\"\"%0D%0A0\"
\n" ); document.write( "

Algebra.Com's Answer #257522 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
\r\n" );
document.write( "\r\n" );
document.write( "\"sin%28theta%29%2F%281-cos%28theta%29%29\"\"%22%22-%22%22\"\"%281%2Bcos%28theta%29%29%2Fsin%28theta%29\"\"%22%22=%22%22\"\"0\"\r\n" );
document.write( "\r\n" );
document.write( "Multiply the first term by the conjugate of the denominator over\r\n" );
document.write( "itself:\r\n" );
document.write( "\r\n" );
document.write( "\"%22%22-%22%22\"\"%281%2Bcos%28theta%29%29%2Fsin%28theta%29\"\"%22%22=%22%22\"\"%0D%0A0\"\r\n" );
document.write( "\r\n" );
document.write( "\"+%28sin%28theta%29%281%2Bcos%28theta%29%29%29%2F%281-Cos%5E2theta%29\"\"%22%22-%22%22\"\"%0D%0A%281%2Bcos%28theta%29%29%2Fsin%28theta%29\"\"%22%22=%22%22\"\"%0D%0A0\"\r\n" );
document.write( "\r\n" );
document.write( "\"+%28sin%28theta%29%281%2Bcos%28theta%29%29%29%2F%28Sin%5E2theta%29\"\"%22%22-%22%22\"\"%0D%0A%281%2Bcos%28theta%29%29%2Fsin%28theta%29\"\"%22%22=%22%22\"\"%0D%0A0\"\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\"+%28cross%28sin%28theta%29%29%281%2Bcos%28theta%29%29%29%2F%28Sin%5Ecross%282%29theta%29\"\"%22%22-%22%22\"\"%281%2Bcos%28theta%29%29%2Fsin%28theta%29\"\"%22%22=%22%22\"\"%0D%0A0\"\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\"+%281%2Bcos%28theta%29%29%2F%28sin%28theta%29%29\"\"%22%22-%22%22\"\"%0D%0A%281%2Bcos%28theta%29%29%2Fsin%28theta%29\"\"%22%22=%22%22\"\"%0D%0A0\"\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\"+%28%281%2Bcos%28theta%29%29-%281%2Bcos%28theta%29%29%29%2Fsin%28theta%29\"\"%22%22=%22%22\"\"%0D%0A0\"\r\n" );
document.write( "\r\n" );
document.write( "\"+%281%2Bcos%28theta%29-1-cos%28theta%29%29%2Fsin%28theta%29\"\"%22%22=%22%22\"\"%0D%0A0\"\r\n" );
document.write( "\r\n" );
document.write( "\"0\"\"%22%22=%22%22\"\"0\"\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\n" ); document.write( "
\n" );