Let \( f(x)=-x^{3}+a x^{2}+b x+5 \sin x \cos x \) be a
P decreasing...
Let \( f(x)=-x^{3}+a x^{2}+b x+5 \sin x \cos x \) be a
P decreasing function on the set \( R \). Then, \( a \) and \( b \)
W satisfy
(1) \( a^{2}+3 b+150 \)
(2) \( a^{2}+3 b+150 \)
(3) \( a^{2}-3 b-150 \)
(4) \( a^{2}-3 b-150 \)
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