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Step * 2 1 of Lemma rcos-radd

.....assertion..... 
1. x : ℝ
2. y : ℝ
⊢ d((rsin(x) * rcos(y)) + (rcos(x) * rsin(y)))/dx = λx.(rcos(x) * rcos(y)) + (-(rsin(x)) * rsin(y)) on (-∞, ∞)
BY
{ (ProveDerivative THEN Auto) }

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Latex:

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Latex:
.....assertion..... 
1.  x  :  \mBbbR{}
2.  y  :  \mBbbR{}
\mvdash{}  d((rsin(x)  *  rcos(y))  +  (rcos(x)  *  rsin(y)))/dx  =  \mlambda{}x.(rcos(x)  *  rcos(y))
+  (-(rsin(x))  *  rsin(y))  on  (-\minfty{},  \minfty{})


By

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Latex:
(ProveDerivative  THEN  Auto)

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