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Given F(x)=f(x)phi(x) and f'(x)phi'(x)=c...

Given `F(x)=f(x)phi(x)` and `f'(x)phi'(x)=c` then prove that `F''(x)/F(x)=(f'')/f+(phi'')/phi+2c`

A

`(d^2y)/(dx^2)`

B

`1/y(d^2y)/(dx^2)`

C

`y(d^2y)/(dx^2)`

D

None of these

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The correct Answer is:
B
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