How do you evaluate cos^-1 (-.6466)cos−1(−.6466)?

1 Answer
Binayaka C.
Jan 22, 2017

In degree cos^-1(-0.6466)=130.2857^0(4dp)cos−1(−0.6466)=130.28570(4dp)
In radian cos^-1(-0.6466)=2.2739(4dp)cos−1(−0.6466)=2.2739(4dp)rad.

Explanation:

Let theta=cos^-1(-0.6466) :. cos theta= (-0.6466) Using calculator for inverse of cos we get theta=130.2857^0(4dp) or theta= 2.2739 (4dp) radian [Ans]

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