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37 lines
762 B
Plaintext
37 lines
762 B
Plaintext
NAME
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cos - cosine
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SYNOPSIS
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cos(x [,eps])
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TYPES
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x number (real or complex)
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eps nonzero real, defaults to epsilon()
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return number
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DESCRIPTION
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Calculate the cosine of x to a multiple of eps with error less in
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absolute value than .75 * eps.
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EXAMPLE
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> print cos(1, 1e-5), cos(1, 1e-10), cos(1, 1e-15), cos(1, 1e-20)
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.5403 .5403023059 .54030230586814 .5403023058681397174
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> print cos(2 +3i, 1e-5), cos(2 + 3i, 1e-10)
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-4.18963-9.10923i -4.189625691-9.1092278938i
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> pi = pi(1e-20)
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> print cos(pi/3, 1e-10), cos(pi/2, 1e-10), cos(pi, 1e-10)
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.5 0 -1
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LIMITS
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none
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LIBRARY
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NUMBER *qcos(NUMBER *x, NUMBER *eps)
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COMPLEX *ccos(COMPLEX *x, NUMBER *eps)
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SEE ALSO
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sin, tan, sec, csc, cot, epsilon
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