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Step * of Lemma rsin-rsub

∀[x,y:ℝ].  (rsin(x - y) = ((rsin(x) * rcos(y)) - rcos(x) * rsin(y)))
BY
{ (Auto THEN Unfold `rsub` 0 THEN RWW "rsin-radd rsin-rminus rcos-rminus" 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[x,y:\mBbbR{}].    (rsin(x  -  y)  =  ((rsin(x)  *  rcos(y))  -  rcos(x)  *  rsin(y)))


By

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Latex:
(Auto  THEN  Unfold  `rsub`  0  THEN  RWW  "rsin-radd  rsin-rminus  rcos-rminus"  0  THEN  Auto)

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