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Fill in the blank Cos _____ equals √3/2 A. 75 B. 30 C. 45 D. 60

Mathematics
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find inverse cos (sqrt(3)/2)
How do I do that?
ok, one moment. I'm close.

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Other answers:

ok, imagine you have a 30 60 90 triangle |dw:1358813789639:dw| cos(30) = sqrt(3)/2 inverse cos (30) = 1/cos(30) 1/cos(30) = 1/(sqrt(3)/2)) 1/cos(30) = 2/(sqrt(3))
actually i messed up a bit on the last part
\[\cos x=\frac{\sqrt{3}}{2}\]\[x=\cos^{-1}\frac{\sqrt{3}}{2}\]
plug that into a calculator and see what you get
cos(30) = 2/sqrt(3) inverse cos (30) = 1/cos(30) 1/cos(30) = 1/(2/sqrt(3)) 1/cos(30) = (sqrt(3)/2))
you do not need a calculator to solve this.
x=60?
actually x= 30. cos(30) = 2/(sqrt(3)) and cos^-1(30) = sqrt(3)/2
Thank you!
yw
i believe it's 30 ...just plug into calculator. ;D
Did it, it's 30. Thank you. (:
im sooo un-usefull on here ...-__- i tried haha at least it was the right answer this time ...

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