Question

write your own cos function that guarantees precision to 8 decimal places. Do not use built in Matlab functions cos, factorial, or power (^).

Answer 1

// Function for calculation

void cal_cos(float n)

{

float accuracy=0.0000001, x1, denominator, cos x, cos val;

// Converting degree to radian

n=n*(3.142/180.0);

x1=1;

//maps the sum along the series

cos x=x1;

//holds the actual value

cos val=cos(n);

int i=1;

do

{

denominator= 2 * i * i (2 * i - 1);

x1= -x1 * n* n/ denominator;

cos x= cos x + x1;

i= i + 1;

}while(accuracy<=fabs(cos val - cos x));

cout<<cos x;

}