acos

The acos function calculates the angle whose cosine is the specified number (the inverse operation of cos).

Syntax

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    acos( X )

Arguments

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• X: A real number in range [-1, 1].

Results

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The value of the arc cosine of X. Returns null if X < -1 or X > 1

Examples

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This example returns 3.141592653589793:

print num = -1
| extend newField = acos( num )