3tg π + 4 cos π - 4sin π/2 + ctg 3π/2 =
= 3 · 0 + 4 · (-1) - 4 · 1 + 0 = 0 - 4 - 4 + 0 = - 8
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3tg π + 4 cos π - 4sin π/2 + ctg 3π/2 =
= 3 · 0 + 4 · (-1) - 4 · 1 + 0 = 0 - 4 - 4 + 0 = - 8