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cos^(-1) (-(1)/(2)) का मुख्य मान ज्ञात क...

`cos^(-1) (-(1)/(2))` का मुख्य मान ज्ञात कीजिए ।

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The correct Answer is:
अतः `cos^(-1) (-(1)/(2))` का मुख्य मान `(2 pi)/(3)` है ।
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