Okay so this is for homework and i am stuck, we have to write our own cos func. I understand how to set every thing up and i was given the formula that

cos(x)=(-1^n)*((x^2n)/(2n)!)

this is what i have set up so far. any help would be great.

I mean i got the function to work by doingCode:#define _CRT_SECURE_NO_WARNINGS #include <stdio.h> #include <math.h> float cosd(float); void main() // shell to test the cosd() function { // This program is a poor example of programming. // It is only for testing another function, in // this case the cosd() function. float angle, answer; do { printf("Enter angle (in degrees): "); scanf("%f",&angle); answer=cosd(angle); printf("cos(%2f)=%6.4f\n\n",angle,answer); } while (angle != -99.0); // -99 is sentinel value } // cosd() function goes here float cosd(float d) { float r,term,sum,result; r=(d)*(3.14159265/180); term=1; while(term > 0.0005) { sum=((r*r)/((term*2)*(2*term-1)))*(term-1); } return sum; }

but my professor wants an algorithm that generates a term based on the previous term and i just don't see how to do it, yet.Code:float cosd(float d) { float r,sum; r=(d)*(3.14159265/180); sum= 1-((pow(r,2)/2))+(pow(r,4)/(4*3*2))-(pow(r,6)/(6*5*4*3*2))+(pow(r,8)/(8*7*6*5*4*3*2))-(pow(r,10)/(10*9*8*7*6*5*4*3*2))+(pow(r,12)/(12*11*10*9*8*7*6*5*4*3*2))-(pow(r,14)/(14*13*12*11*10*9*8*7*6*5*4*3*2)); return sum; }