а) cos(π/2 + t)/sin(π - t)tg(-t) = -sin(t)/sin(t) × (-tg(t)) = 1/tg(t) = ctg(t)
б) sin^2 (π + t) - sin^2 (π - t) = sin^2 (t) - sin^2 (t) = 0
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Answers & Comments
а) cos(π/2 + t)/sin(π - t)tg(-t) = -sin(t)/sin(t) × (-tg(t)) = 1/tg(t) = ctg(t)
б) sin^2 (π + t) - sin^2 (π - t) = sin^2 (t) - sin^2 (t) = 0