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In mathematics, the inverse trigonometric functions are the inverse functions of the trigonometric functions.

For example, arcsin 0.4 = sin^1 0.4 = 23o 34' 41.443" = 23.57817848o + k×360o (k=..-1,0,1,..) = -336.42182152o, 23.57817848o, 383.57817848o, .. = 0.41151685rad + k×2π (k=..-1,0,1,..) = -1.86901012π, 0.13098988π, 2.13098988π, ..

For example, arcsin -0.5 = sin^1 -0.5 = -30o 0' -0" = -30o + k×360o (k=..-1,0,1,..) = -390o, -30o, 330o, .. = -0.52359878rad + k×2π (k=..-1,0,1,..) = -2.16666667π, -0.16666667π, 1.83333333π, ..

y=arcsin(x) Graph
	Y (Degrees) Y (Radian) X 90 π/2 1 60 π/3 0.866025 45 π/4 0.707107 30 π/6 0.5 0 0 0 -30 -π/6 -0.5 -45 -π/4 -0.707107 -60 -π/3 -0.866025 -90 -π/2 -1