Prove that, Cos^2A + Cos^2B-Cos^2C = 1-2SinA.SinB.Cos.C
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Cos(180°) is -1,
^you see that small hollow circle above 0 in 180? Yeah, that is said to be degree and without which the meaning of the question is completely changed.
What you asked was in radians! for example :
Cos(180) here 180 is in radians and so its value will be -0.59….Cos(180°) here it's in degrees so its value will be (-1)(And π radians is equal to 180°)
Hope this helps!
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