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The value of \( \lambda \) so that function of is defined by -
\[
f(x)=\left\{\begin{array}{lll}
\lambda x, & \text { if } & x \leqslant \pi \\
\cos x, & \text { if } & x\pi
\end{array}\right.
\]
is continues at \( x=\pi \) is
\( \mathrm{P} \)
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