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32 lines
651 B
Plaintext
32 lines
651 B
Plaintext
NAME
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atan - inverse trigonometric tangent
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SYNOPSIS
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atan(x [,eps])
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TYPES
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x real
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eps nonzero real, defaults to epsilon()
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return real
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DESCRIPTION
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Returns the atan of x to a multiple of eps with error less in
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absolute value than .75 * eps.
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v = atan(x) is the number in (-p1/2, pi/2) for which tan(v) = x.
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EXAMPLE
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> print atan(2, 1e-5), atan(2, 1e-10), atan(2, 1e-15), atan(2, 1e-20)
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1.10715 1.1071487178 1.107148717794091 1.10714871779409050302
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LIMITS
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unlike sin and cos, x must be real
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eps > 0
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LIBRARY
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NUMBER *qatan(NUMBER *x, NUMBER *eps)
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SEE ALSO
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asin, acos, asec, acsc, acot, epsilon
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