33 lines
858 B
C
33 lines
858 B
C
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/*
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* C program to find the sum of cos(x) series
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*/
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#include <stdio.h>
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#include <math.h>
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void main()
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{
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int n, x1, i, j;
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float x, sign, cosx, fact;
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printf("Enter the number of the terms in a series\n");
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scanf("%d", &n);
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printf("Enter the value of x(in degrees)\n");
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scanf("%f", &x);
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x1 = x;
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/* Degrees to radians */
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x = x * (3.142 / 180.0);
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cosx = 1;
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sign = -1;
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for (i = 2; i <= n; i = i + 2)
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{
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fact = 1;
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for (j = 1; j <= i; j++)
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{
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fact = fact * j;
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}
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cosx = cosx + (pow(x, i) / fact) * sign;
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sign = sign * (-1);
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}
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printf("Sum of the cosine series = %7.2f\n", cosx);
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printf("The value of cos(%d) using library function = %f\n", x1,
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cos(x));
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}
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