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If f (x) is a function such that f''(x)+...

If f (x) is a function such that `f''(x)+f(x)=0` and `g(x)=[f(x)]^(2)+[f'(x)]^(2)` and `g(3)=3` then `g(8)=`

A

0

B

3

C

5

D

8

Text Solution

Verified by Experts

The correct Answer is:
D
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