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Question
Is cos–1(– x) = π – cos–1 true? justify your answer
Solution
Let π = cos–1(– x)
⇒ cos π = – x
⇒ – cos π = x
⇒ cos(π – π) = x
⇒ π – π = cos–1 x
⇒ π – cos–1x = π
⇒ π – cos–1x = cos–1(– x)
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