1.

Given \[\int\limits_{0}^{\pi /2}{\frac{dx}{1+\sin x+\cos x}=\log \,2.}\] Then the value of the definite integral \[\int\limits_{0}^{\pi /2}{\frac{\sin x}{1+\sin x+\cos x}dx}\]is equal to

A. \[\frac{1}{2}\log 2\]       
B. \[\frac{\pi }{2}-\log 2\]
C. \[\frac{\pi }{4}-\frac{1}{2}\log 2\]          
D. \[\frac{\pi }{2}+\log 2\]
Answer» D. \[\frac{\pi }{2}+\log 2\]


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