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Let f(t)=|{:(cost,t,1),(2sint,t,2t),(sin...

Let `f(t)=|{:(cost,t,1),(2sint,t,2t),(sint,t,t):}|" then "underset(trarr0)lim(f(t))/t^2` equal to `".........."`

A

3

B

1

C

`-1`

D

0

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