Le \( f: R \rightarrow\left[0, \frac{\pi}{2}\right) \) be defined b... VIDEO
Le \( f: R \rightarrow\left[0, \frac{\pi}{2}\right) \) be defined by
P \( f(x)=\tan ^{-1}\left(3 x^{2}+6 x+a\right) \). If \( f(x) \) is an onto function,
W then the value of \( a \) is
(a) 1
(b) 2
(c) 3
(d) 4
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