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निम्नलिखित के मुख्य मानों को ज्ञात कीजिए : `cos^(-1)(-(1)/(sqrt2))` |
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Answer» `cos^(-1)(-(1)/(sqrt2))=pi-cos^(-1)((1)/(sqrt2))` `=pi-cos^(-1)(cos""(pi)/(4))` `=pi-(pi)/(4)=(3pi)/(4)` |
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