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= 4tgα - 5 / 1 + 3tgα = (tgα = 5) = 4*5 - 5 / 1 + 3*5 = 15/16
b) -3cosα + 6sinα / 8sinα + 3cosα = (dzielę licznik i mianownik przez sinα)
= -3ctgα + 6 / 8 + 3ctgα = (ctgα = -2) = -3*(-2) + 6 / 8 + 3*(-2) =
= 12/2 = 6
GOTOWE!!!