Page 36 - sss_Neat
P. 36
= sin ( − )
= − sin ( + )
= +
= sin( − ) − sin( + )
= [sin( − ) − sin( + )]
1 1
= 2 sin [( − ) − ( + )] cos [( − ) + ( + )]
2 2
1 1
= 2 sin (2 ) cos (2 )
2 2
= 2 sin( ) cos( )
′
= 2 sin 
