simplify the inverse trig function with answers (-inf, +inf): cos(inverse)(sqrt3/2)

Question

anonymous · Answer

answers from $$(-\infty,\infty)$$ equation is $$\cos^{-1} (\sqrt{3}/2)$$

anonymous · Answer

Cosine takes in angles and gives out a ratio of sides.
Inverse cosine goes backwards. It takes in a ratio of sides, and it tells you what angles have that ratio.

anonymous · Answer

And cos is a/h, so just make a triangle with those sides, then figure out what the angle is.

anonymous · Answer

still have your unit circle or you got it memorized?

anonymous · Answer

I wouldn't use the unit circle here, since the hypotenuse is 2.

anonymous · Answer

But I suppose you could.

anonymous · Answer

sqrt3/2 is a cos/sin of one of the common angles though right?

anonymous · Answer

probably... maybe. Lols.

anonymous · Answer

i have the unit circle i know most of it by heart

anonymous · Answer

ok...
cos(what angle) = sqrt3/2  ???

anonymous · Answer

wait cos is the x-value right? o.o

anonymous · Answer

correct

anonymous · Answer

30 degrees?

anonymous · Answer

yes... but what else?

anonymous · Answer

300 degrees?

anonymous · Answer

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