Ответы на вопрос:
Cos(pi + a) = -cos(a) tg(pi + a) = tg(a) sin(3/2 * pi - a) = sin(-pi/2 - a) = -sin(a + pi/2) = -cos(a) ctg(pi/2 - a) = tg(a) tg(a) - tg(a) + (-cos(a))/(-cos(a)) = 1
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