ctg(-t)*sin(t)+cos(p+t)
=-ctg(t)*sin(t)+cos(p+t) = -cos (t)/sin (t)* sin(t)-cos (t) = -cos (t)-cos (t) = -2cos(t)
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=-ctg(t)*sin(t)+cos(p+t) = -cos (t)/sin (t)* sin(t)-cos (t) = -cos (t)-cos (t) = -2cos(t)