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Cos^ -1 (-x)=-Cos^ -1 xfor-1<= x<=1 true or false
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Cos^ -1 (-x)=-Cos^ -1 xfor-1<= x<=1 true or false

User Mxlhz
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1 Answer

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It's false. Take x = -1, then

cos⁻¹(-(-1)) = cos⁻¹(1) = 0

but

-cos⁻¹(-1) = -π

User Peter Dietz
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