Question
Thu March 22, 2012 By:
 

sin theta + cos theta = 1 TPT:- cos theta - sin theta = + - 1

Expert Reply
Thu March 22, 2012
If , sinA + cosA =1
Squaring both sides we get , sin2A + cos2A + 2cosAsinA = 1 , 1 + 2cosAsinA = 1 , 2cosAsinA = 0
 
So , (CosA - sinA)2 = 1 - 2cosAsinA = 1 - 0 = 1
 
thus , CosA - SinA = +-1
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