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The drivative of e^(ax)cos bx with rexpe...

The drivative of `e^(ax)cos` bx with rexpect to x is `re^(ax)cosbx+"tan"^(-1)(b)/(a)`. When `agt0,bgt0`, the value of r is :

A

`a+b`

B

`ab`

C

`(1)/(sqrt(ab))`

D

`sqrt(a^(2)+b^(2))`

Text Solution

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The correct Answer is:
D
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