Question
Asked Oct 30, 2019
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Use the given information to find each of the following.
1
with 0 x<
4
1. cos
given cos x =
2'
2
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Use the given information to find each of the following. 1 with 0 x< 4 1. cos given cos x = 2' 2

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Expert Answer

Step 1

Since x is in 0 to pi/2 

So x/2 will be in 0 to pi/4.

So x/2 is in first quadrant. So cos(x/2) will be positive. 

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0<x< 2 X <- 2 2x2 X 0< 2 4

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Step 2

Use half angle formula for ...

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1 cOSx 4 х 2 cos2 -1= 2 1 +1 х 2 cos2 5 X 2 cos2

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