Answer to Question #50664 in Trigonometry for tinn

Question #50664

cos^(-1)⁡(-x)= - cos^(-1)⁡(x)or cos^(-1)⁡(x) ?? which one is correct?

sec^(-1)⁡(-x)= - sec^(-1)⁡(x)or sec^(-1)⁡(x) ?? which one is correct?

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