Write the principal value of cos^ -1 (1 2 )-2sin^ -1 (-1 2 ). - Vidyadip

Question

Write the principal value of $\text{cos}^{-1}\Bigg(\frac{1}{2}\Bigg)-2\text{sin}^{-1}\Bigg(-\frac{1}{2}\Bigg).$

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Answer

$\frac{2\pi}{3}$.

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