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



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tomo
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find inverse cos (sqrt(3)/2)

marcoduuuh
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How do I do that?

tomo
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ok, one moment. I'm close.

tomo
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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))

marcoduuuh
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tomo
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actually i messed up a bit on the last part

RyanL.
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\[\cos x=\frac{\sqrt{3}}{2}\]\[x=\cos^{1}\frac{\sqrt{3}}{2}\]

RyanL.
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plug that into a calculator and see what you get

tomo
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cos(30) = 2/sqrt(3)
inverse cos (30) = 1/cos(30)
1/cos(30) = 1/(2/sqrt(3))
1/cos(30) = (sqrt(3)/2))

tomo
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you do not need a calculator to solve this.

marcoduuuh
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x=60?

tomo
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actually x= 30. cos(30) = 2/(sqrt(3)) and cos^1(30) = sqrt(3)/2

marcoduuuh
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Thank you!

tomo
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yw

tashastevens1
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i believe it's 30 ...just plug into calculator. ;D

marcoduuuh
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Did it, it's 30. Thank you. (:

tashastevens1
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im sooo unusefull on here ...__ i tried haha at least it was the right answer this time ...