\( f_{1}(x)=2 x, f_{2}(x)=3 \sin x-x \cos x \) then for \( x \in(0,...
\( f_{1}(x)=2 x, f_{2}(x)=3 \sin x-x \cos x \) then for \( x \in(0, \pi / 2) \)
(A) \( f_{1}(x)f_{2}(x) \)
(B) \( \quad f_{1}(x)f_{2}(x) \)
\( \mathrm{P} \)
(C) \( \quad f_{1}(|x|)f_{2}(|x|) \)
(D) none of these
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