Ответы на вопрос:
Ctg(t - π) = ctgt = -0,75. a) cos(3π/2 - t) = -sint. ctg²t + 1 = 1/sin²t < => sin²t = 1/(ctg²t + 1) = 0,64 => sint = 0,8, т.к. при π/2 < t < π sint > 0. cos(3π/2 - t) = -sint = -0,8. б) cos(π + t) = -cost. cos²t = 1 - sin²t = 0,36 => cost = -0,6, т.к. при π/2 < t < π cost < 0. cos(π + t) = -cost = 0,6.
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