Cos result is incorrect

Question

I import "math.h".

I can use the cos function, but when I execute the cos(0.321139585333178) result0.948876

If I use a calculator on a Mac or use a regular calculator, the result will be 0.999984292347418

Can someone help me solve this problem?

Answer 1

You confuse degrees with radians .

cos (0.321139585333178 degrees) = 0.999984292

cos (0.321139585333178 radians) = 0.948876326

• To convert from radians to degrees, multiply by 180 / π.
• To convert from degrees to radians, multiply by π / 180.