The principle value of ^-1[(-2)]
Applying the basic concept, using formula we get 0. Calculation gives this directly, check steps: apply rule, substitute values, simplify to get 0.
Ref: NCERT Mathematics Class XI — Trigonometry
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What will be the value of ^-1 ( 2 /2 ) = ?
In easy words, solving fully: apply relevant formula, put numbers, compute. Result comes as Does not exist. Easy verification shows it satisfies condition.
Ref: NCERT Mathematics Class XI — Trigonometry
