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What’s the difference between cos 71º and cos-1 0.71?

I just need a detailed, but simple explanation 🙂

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One Response to “What’s the difference between cos 71º and cos-1 0.71?”

  1. Kristof said :

    cos 71º =0.3255
    cos(-10.71)=-0.2817

    The difference in values is 0.3255-(-0.2817)=0.6072

    The difference in notation
    cos 71º here means cos of 71 degrees
    but cos (-10.71) means cos of -10.71 radians,
    360º=2*pi rad= 2*3.14 rad=6.28 rad
    180º=pi rad=3.14 rad

    When symbol º is not written we can suppose that the angle is in radians.




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