Trigonomeetrilised funktsioonid Valemid sin2x + cos2x = 1 sin2x = 1 cos2x cos2x = 1 sin2x tanx = sinx / cosx 1 + tan2x = 1 / cos2x sin2x = 2sinx x cosx cos2x = cos2x sin2x tan2x = 2tanx / (1 tan2x) sinx/2 = ± ((1 cosx) / 2) cosx/2 = ± ((1 cosx) / 2) tanx/2 = ± ((1 cosx) / (1 + cosx)) sin(x ± y) = sinx x cosy ± cosx x siny cos(x ± y) = cosx x cosy ±vp! sinx x siny tan (x ± y) = (tanx ± tany) / (1 ±! tanx x tany) sin(90 x) = cosx cos(90 x) = sinx tan(90 x) = cotx cot(90 x) = tanx sin(180 x) = sinx sin(180 + x) = -sinx sin(360 x) = -sinx sin ++-- ; cos +--+ ; tan +-+- sinx = m = x = (-1)n arcsinm + n ; n Z cosx = m = x = ±arccosm + 2n ; n Z tanx = m = x = arctanm + n ; n Z SIN, COS, TAN joonised ! SIN x I - I -3/4 I -/2 I /4 I -/6 I 0 I sin x I 0 I -0,7 I -1 I -0,7 I -0,5 I 0 I x I /6 I /3 I /2 I 5/6 I 2/3 I I
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