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How do I put "cos-1" on the calculator?

I don't know how

Guest Mar 28, 2017
 #1
avatar+93338 
+1

inverse cos is the same as arc cos

 

use      acos 

Melody  Mar 28, 2017
 #2
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So I am supposed to answer this problem.

the problem is that I don't know what to write on the calculator....

Guest Mar 28, 2017
edited by Guest  Mar 28, 2017
 #3
avatar+93338 
+1

The vertical red line is 0.5 units and it is opposite the angle that you want

 

The horozontal part of the right triangle is 0.87 units long and that is the adjacent side.

 

tan = opp/hyp

 

so

 

tan(v)  =  0.5 / 0.87

 

v = atan(0.5/0.87)

 

atan(0.5/0.87) = 29.886526940424

 

v=29.88 degrees

Melody  Mar 28, 2017

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