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Trigonometric functions: Difference between revisions
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{{works with|QuickBasic|4.5}}
QuickBasic 4.5 does not have arcsin and arccos built in. They are defined by identities found [http://en.wikipedia.org/wiki/Arctan#Relationships_among_the_inverse_trigonometric_functions here].
radians = pi / 4 'a.k.a. 45 degrees
▲ pi = 3.141592653589793#
▲ PRINT TAN(radians) + " " + TAN (degrees) 'tangent
arcsin = 2 * ATN(SIN(radians)) * radians / (1 + SQR(1 - radians ^ 2))
▲ 'arcsin
arccos = 2 * ATN(COS(radians)) * SQR(1 - radians ^ 2) / (1 + radians)
▲ 'arccos
=={{header|C}}==
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