- From where did we get that DY/DX (SIN(X)= COS(X) COS(X)=-SIN(X) need proof please !?

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Really need help on probability math question? (a/1) + b - 1.5=0
(a/2) +b - 9 = 0
how would you solve these equations simultaneously? Is the earth flat or flat? Calculate the freezing point of an aqueous 0.20 m FeCl3 solution using a van't Hoff factor of 3.2.? Can children have medical imaging procedure performed ?