Solve this cos^1(-1/2)=?
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I think this is an inverse trigonometric question.
Answer is like this:
cos^-1(-1/2)
=π-cos^-1(1/2)
=π-π/3
=2π/3
Answer is like this:
cos^-1(-1/2)
=π-cos^-1(1/2)
=π-π/3
=2π/3
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