# What is #\cos ^{-1}(.60)#?

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Note that

In this case

"Which angle has a

The only way to determine this is with a calculator or tables.

Using a graph is possible, but not accurate enough.

Depending on which calculator you have, the following are possible key presses:

D.A.L. calculators:

shift

The answer will be

Or

The answer will be

Note that this is only the acute angle, the 1st quadrant angle.

In the 4th quadrant,

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