Question
Sun September 15, 2013 By: Manisha Vadagave
 cos-sin

prove that

Expert Reply
Sun September 15, 2013

 cos-sin = sin 

Squaring both sides, we get,

 cos2+sin2-2 cossin = 2sin2 

 cos2-sin2-2 cossin = 0

 (cos-sin) (cos+sin)-2 cossin = 0

 sin (cos+sin) = 2 cossin

cos+sin =  cos

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