56 lines
587 B
C++
56 lines
587 B
C++
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// Do the exponential cosine function.
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#include "stdafx.h"
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#include "defs.h"
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void
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eval_expcos(void)
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{
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push(cadr(p1));
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eval();
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expcos();
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}
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void
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expcos(void)
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{
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save();
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p1 = pop();
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push(imaginaryunit);
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push(p1);
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multiply();
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exponential();
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push_rational(1, 2);
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multiply();
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push(imaginaryunit);
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negate();
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push(p1);
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multiply();
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exponential();
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push_rational(1, 2);
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multiply();
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add();
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restore();
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}
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#if SELFTEST
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static char *s[] = {
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"expcos(x)",
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"1/2*exp(-i*x)+1/2*exp(i*x)",
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};
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void
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test_expcos(void)
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{
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test(__FILE__, s, sizeof s / sizeof (char *));
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}
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#endif
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