Question 18
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sin + cos =root2 cos
​sin = root2 cos -cos
​taking cos common in rhs
​sin = (root2 -1)cos
(​​root2+1)(root2 - 1)cos/root2+1= sin
(2-1)cos/root2 - 1=sin
cos =sin(root2 -1)
cos = root2 sin -sin
cos + sin =root2 sin
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i think  he is write.
 
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Raja we need to prove cos-sin=root2sin
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