Why did Pharaoh find it necessary to add that he had never seen such cows in his life?
Seforno, Malbim: To make it clear that his dream was not the result of things that he had thought during the day. 1
Seforno: See Daniel 2:29.
What does "Ra'os To'ar" add to "Dalos"?
Ha'amek Davar: "Ra'os To'ar" means that the sides 'fall' (recess) between the bones, and "Dalos" means that there is no meat between the bones and the skin.
QUESTIONS ON RASHI
Rashi writes: "Dalos (poor) - [I.e.] Kechushos (lean)." What is Rashi explaining?
Gur Aryeh: Do not translate "Dal" as 'impoverished.'
Rashi writes: "'Rakos Basar' - Any [use of the word] "Rakos" in Scripture means 'deficient in flesh.'" What about when the term 'Reik' means 'empty' (e.g. 37:24; 41:27)?
Gur Aryeh: The two words have different roots, and different (albeit related) meanings. "Rakos" (in our verse) is from root Resh-Kuf-Kuf, 1 which means "deficient." The word "Reik" (37:24), on the other hand, has root Resh-Yud-Kuf, 2 meaning "empty."
The Dagesh in the Kuf shows that it stands in place of two Kufs. Another example from this root is "Rakaso" (Shoftim 4:21), the temple (of the face), a place on the body where the flesh is deficient. (CS)
Words based on this Shoresh will generally have a Yud (or at least the vowel Tzeirei on the Resh).