If \( \int x e^{-5 x^{2}} \sin 4 x^{2} d x=K e^{-5 x 2}\left(A \sin 4 x^{2}+\right. \) \( \left....
If \( \int x e^{-5 x^{2}} \sin 4 x^{2} d x=K e^{-5 x 2}\left(A \sin 4 x^{2}+\right. \) \( \left.B \cos 4 x^{2}\right)+C \). Then
(a) \( K=-1 / 82 \)
(b) \( K=1 / 82 \)
(c) \( A=5 \)
(d) \( A=3 \)
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