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sin(pi/2+t)-cos(pi+t)=1

sin(π/2+t) = cos(t).
cos(π+t) = -cos(t).
cos(t)+cos(t) = 1.
2cos(t) = 1.
cos(t) = 1/2.
t = ±π/3 + 2πn, n принадлежит Z.