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प्रश्न
If f(x) = x sinx, then f" `pi/2` is equal to ______.
विकल्प
0
1
–1
`1/2`
उत्तर
If f(x) = x sinx, then f" `pi/2` is equal to 1.
Explanation:
As f′(x) = x cosx + sinx
So, f' `pi/2 = pi/2 cos pi/2 + sin pi/2` = 1
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