NDA Math Area Under the Curves

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For the next two (2) items that follow:
Consider the curves y = sin x and y = cos x.
[NDA I 2015]
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Question : 21 of 27
 
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What is the area of the region bounded by the above two curves and the lines x=0 and x=‌
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4
?
[NDA I 2015]
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