Ответ:
cos(t)^2-sing(t)^2-cos(t)^2/sing(t)^2=-sing(t)^2/sing(t)^2=-1
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Ответ:
cos(t)^2-sing(t)^2-cos(t)^2/sing(t)^2=-sing(t)^2/sing(t)^2=-1