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the derivative of e^(ax) cos bx with...

the derivative of `e^(ax) cos ` bx with respect to x is `re^(ax) cos (bx + tan ^(-1) (b ) /(a))` when `a gt 0, b gt 0 ` then value r is

A

`a + b`

B

`ab`

C

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

D

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

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The correct Answer is:
D
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