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(d)/(dx)cos x^(0)= (A)-sin x^(0) (B)-(pi...

`(d)/(dx)cos x^(0)`=
(A)`-sin x^(0)`
(B)`-(pi)/(180)sin x^(0)`
( C) `(pi)/(180)sin x^(0)`
(D) `(2 pi)/(180)sin x^(0)`

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