Q. 9
If 
then write the value of 
Answer :
Given, 
We should find the value for 
[by using the formulae, sin2θ + cos2θ = 1 and sin2θ = 2 sinθcosθ]
As already mentioned in the question, 
, so x lies in the 1st quadrant and both sine and cosine functions are positive.
Therefore, 
sin x + cos x
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