Question
Asked Nov 23, 2019
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(Photo attached) decide whether the answer to each problem is correct.  If it is not, identify the issue and solve it correctly for 0 ≤ x < 2 π.  You must show work for this, all answers should be in radians.

cos2(a)
3
has the solution x =
4
117T
63
6
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cos2(a) 3 has the solution x = 4 117T 63 6

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Expert Answer

Step 1

Given: -

cos (x)=
4
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cos (x)= 4

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Step 2

To find: -

To find the value ofx
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To find the value ofx

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Step 3

Calculation...

3
It is given that cos (x)
3
cos (x)
-
4
Let cos2x u
3
4
3
u = ±.
2
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3 It is given that cos (x) 3 cos (x) - 4 Let cos2x u 3 4 3 u = ±. 2

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Math

Trigonometry

Trigonometric Ratios

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