Q. 9

# If then write the value of

Answer :

Given,

We should find the value for

[by using the formulae, sin^{2}θ + cos^{2}θ = 1 and sin2θ = 2 sinθcosθ]

As already mentioned in the question, , so x lies in the 1^{st} quadrant and both sine and cosine functions are positive.

Therefore, sin x + cos x

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