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If f(x) is continuous and f(9/2)=2/9 , t...

If f(x) is continuous and `f(9/2)=2/9` , then : `lim_(x to 0) f((1-cos 3x)/(x^2))`=

A

`2/9`

B

`9/2`

C

18

D

81

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The correct Answer is:
a
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