If \( f(x)=\left\{\begin{array}{cc}\frac{\sin (a+2) x+\sin x}{x} & ; x0 \\ b & ; x=0 \\ \frac{\l...
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0If \( f(x)=\left\{\begin{array}{cc}\frac{\sin (a+2) x+\sin x}{x} & ; x0 \\ b & ; x=0 \\ \frac{\left(x+3 x^{2}\right)^{1 / 3}-x^{1 / 3}}{x^{4 / 3}} & ; x0\end{array}\right. \)
\( \mathrm{P} \) is continuous at \( x=0 \), then \( a+2 b \) is equal to :
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(1) 1
(2) 0
(3) \( -2 \)
(4) \( -1 \)
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