If \( \int x^{6} \sin \left(5 x^{7}\right) d x=\frac{k}{5} \cos \left(5 x^{7}\right)+C, x \neq 0...
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0If \( \int x^{6} \sin \left(5 x^{7}\right) d x=\frac{k}{5} \cos \left(5 x^{7}\right)+C, x \neq 0 \),
(A) \( k=7 \)
(B) \( k=-7 \)
(C) \( k=\frac{1}{7} \)
(D) \( k=-\frac{1}{7} \)
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