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

Cos^ -1 (-x)=-Cos^ -1 xfor-1<= x<=1 true or false
asked 143k views
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Cos^ -1 (-x)=-Cos^ -1 xfor-1<= x<=1 true or false

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User Mxlhz
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8.1k points

1 Answer

2 votes

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

cos⁻¹(-(-1)) = cos⁻¹(1) = 0

but

-cos⁻¹(-1) = -π

answered
User Peter Dietz
by
8.1k points
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