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Physical quantity x and y are related a...

Physical quantity `x` and `y` are related as `y=4tanx` .If at `x=(pi)/(4)` radian error in measurement of `x` is `2%` then find `%` error in measurement of `y` at `x=(pi)/(4)`

A

`2%`

B

`(pi)/(2)%`

C

`(pi)/(6)%`

D

`pi%`

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The correct Answer is:
B
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