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

arccos 0.5 = cos⁻¹ 0.5 = 60º 0' 0" = 60º + k×360º (k=..-1,0,1,..) = -300º, 60º, 420º, .. = 1.04719755rad + k×2π (k=..-1,0,1,..) = -1.66666667π, 0.33333333π, 2.33333333π, ..

arccos -0.3 = cos⁻¹ -0.3 = 107º 27' 27.371" = 107.45760312º + k×360º (k=..-1,0,1,..) = -252.54239688º, 107.45760312º, 467.45760312º, .. = 1.87548898rad + k×2π (k=..-1,0,1,..) = -1.40301332π, 0.59698668π, 2.59698668π, ..

y=arccos(x) Graph
	Y (Degrees) Y (Radian) X 180 ̊ π -1 150 ̊ 5π/6 -0.866025 135 ̊ 3π/4 -0.707107 120 ̊ 2π/3 -0.5 90 ̊ π/2 0 60 ̊ π/3 0.5 45 ̊ π/4 0.707107 30 ̊ π/6 0.866025 0 ̊ 0 1