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/*
* Copyright (C) 2000, Imperial College
*
* This file is part of the Imperial College Exact Real Arithmetic Library.
* See the copyright notice included in the distribution for conditions
* of use.
*/
#include <stdio.h>
#include "real.h"
Real
cos_QZ(mpz_t a, mpz_t b)
{
mpz_t x;
Real r;
mpz_init(x);
mpz_mul_ui(x, b, 2);
r = tan_QZ(a, x);
mpz_clear(x);
r = tensor_Int(r, r, -1, 1, 0, 0, 0, 0, 1, 1);
return r;
}
Real
cos_QInt(int a, int b)
{
Real r;
mpz_t ap, bp;
/* check for overflow */
if (b > 0x3FFFFFFF || b < 0xC0000000) {
mpz_init_set_si(ap, a);
mpz_init_set_si(bp, b);
mpz_mul_ui(bp, bp, 2);
r = tan_QZ(ap, bp);
mpz_clear(ap);
mpz_clear(bp);
}
else
r = tan_QInt(a, b * 2);
r = tensor_Int(r, r, -1, 1, 0, 0, 0, 0, 1, 1);
return r;
}
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