\[ f(u)=\left\{\begin{array}{cc} a \sin \pi / 2(u+1) & u \leqslant 0 \\ \frac{\tan v-\sin u}{u^{...

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\[
f(u)=\left\{\begin{array}{cc}
a \sin \pi / 2(u+1) & u \leqslant 0 \\
\frac{\tan v-\sin u}{u^{3}} & u0
\end{array}\right.
\]
\( f \) is continous at \( u=0 \) then find a
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