c - cos result incorrect -

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I import "math.h".

I can use the cos function, but when I execute cos (0.321139585333178) result 0.948876

if If I use the calculator in Mac or use the normal calculator, then result 0.999984292347418

Can someone help me solve that problem?

= 0.99984292

= 0.948876326

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

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