0.524 or pi/6
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The trigonometric function of an angle gives a certain value The arc trigonometric function of value is simply the angle For example, if sin (30 degrees) = 0.500 then arc sine ( 0.500) = 30 degrees
That depends on the numerical value of x.
tan (30 degrees) would be equal to 0.577350269.
mostly it comes from memorization. If sin 30 = 1/2, then arcsin (1/2) = 30
(30+360*k) and (150+360*k) degrees where k is any integer.