document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=535135>Question 535135</A>: <I><SPAN STYLE=\"word-break: break-all;\"> how do i verify and prove that \r<BR>\n" );
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document.write( "sin(beta - 3[pi]/2) = cos (beta) </SPAN>\n" );
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document.write( "sin(beta - 3[pi]/2) = cos (beta)<BR>\n" );
document.write( "**<BR>\n" );
document.write( "Use x in place of beta<BR>\n" );
document.write( "starting with left side<BR>\n" );
document.write( "use addition formula for sin<BR>\n" );
document.write( "sin(x-3&#960;/2)=[sinx*cos(3&#960;/2)]-[cosx*sin(3&#960;/2)]<BR>\n" );
document.write( "cos(3&#960;/2)=0<BR>\n" );
document.write( "sin(3&#960;/2)=-1<BR>\n" );
document.write( "sin(x-3&#960;/2)=[sinx*0]-[cosx*(-1)]=0-(-cosx)=cosx<BR>\n" );
document.write( "Verified: <BR>\n" );
document.write( "left side=right side </SPAN>\n" );
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