document.write( "Question 821608: prove identity of cos(3pi/2+x)=sinx \n" ); document.write( "

Algebra.Com's Answer #494355 by lwsshak3(11628) $\"\"$ $\"About$

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prove identity of
\n" ); document.write( "cos(3pi/2+x)=sinx
\n" ); document.write( "start with left side:
\n" ); document.write( "using cos addition formula:
\n" ); document.write( "

\n" ); document.write( "verified: left side=right side \n" ); document.write( "

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