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prove that

Asked by Manisha Vadagave 15th September 2013, 8:02 PM
Answered by Expert
Answer:

 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

Answered by Expert 15th September 2013, 9:45 PM
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