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Step * 1 of Lemma rcos-nonzero-on

.....antecedent..... 
d(rcos(x))/dx = λx.-(rsin(x)) on (-(π/2), π/2)
BY
{ (InstLemma  `derivative-rcos` [] THEN DerivativeFunctionality (-1) THEN Auto) }

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Latex:

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Latex:
.....antecedent..... 
d(rcos(x))/dx  =  \mlambda{}x.-(rsin(x))  on  (-(\mpi{}/2),  \mpi{}/2)


By

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Latex:
(InstLemma    `derivative-rcos`  []  THEN  DerivativeFunctionality  (-1)  THEN  Auto)

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