document.write( "Question 725643: simplify the ff:\r
\n" ); document.write( "\n" ); document.write( "cos(p+z)-cos(p-z) \n" ); document.write( "

Algebra.Com's Answer #444413 by lwsshak3(11628) $\"\"$ $\"About$

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simplify the ff:
\n" ); document.write( "cos(p+z)-cos(p-z)
\n" ); document.write( "Identity: cos s-cos t=-2 sin (s+t)/2 sin (s-t)/2
\n" ); document.write( "cos(p+z)-cos(p-z)
\n" ); document.write( "=-2 sin (p+z+p-z)/2 sin (p+z-p+z)/2
\n" ); document.write( "=-2 sin (2p)/2 sin (2z)/2
\n" ); document.write( "=-2 sin(2p)sin(2z)/4
\n" ); document.write( "=-sin(2p)sin(2z)/2
\n" ); document.write( " \n" ); document.write( "

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