а) (sint - cost)^2 + sint cost
б) (sint + cost)^2 - 2 sint cost
а)(sin t-cost)^2+2 sint*cost sin^2(t)-2sin(t)cos(t)+cos^2(t)+2sin(t)cos(t)
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а)(sin t-cost)^2+2 sint*cost
sin^2(t)-2sin(t)cos(t)+cos^2(t)+2sin(t)cos(t)