Question

principal value of cos inverse (1)​

Answer 1

Step-by-step explanation:

Therefore, principal value of cos−1 ½ is π3 and its general value = 2nπ ± π3. Therefore, principal value of cos−1 (-½) is 2π3 and its general value = 2nπ ± 2π3.

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Answer 2

Answer:

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Step-by-step explanation:

Therefore, principal value of cos−1½ is π3 and its general value = 2nπ ± π3. Therefore, principal value of cos−1 (-½) is 2π3 and its generalvalue = 2nπ ± 2π3.