Prove that: `sin^(-1)(-4/5)=tan^(-1)(-4/3)=cos^(-1)(-3/5)-pi`

Explanation

To prove that:

\[ \sin^{-1}\left(-\frac{4}{5}\right) = \tan^{-1}\left(-\frac{4}{3}\right) = \cos^{-1}\left(-\frac{3}{5}\right) - \pi \]

we will break down the proof into steps.

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