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Chapter 16: Mathematics – More Fun With Numbers. Page 244
Inverse Cosine:
The inverse cosine function acos() will return an angle measurement in
radians for the specified cosine value. This function performs the opposite of
the cos() function.
Illustration 28: Acos() Function
Inverse Sine:
The inverse sine function asin() will return an angle measurement in radians
for the specified sine value. This function performs the opposite of the sin()
function.
© 2019 James M. Reneau (CC BY-NC-SA 3.0 US)

