[Tavkel Nayman]

1.1)cos(arcsin(3/5)+arccos(4/5)) = cos(arccos(4/5)+arccos(4/5)) = [cos(arccos(4/5)]^2-1 = -(9/25)
1.2)cos(arcsin(3/5)+arccos(4/5)) = cos(-arccos(4/5)+arccos(4/5)) = cos(0) = +1/-1

2) Ща добавлю - бумага нужна.[COLOR="Silver"]

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