If cosX = 1/5 and angle x is a positive acute angle, find the value of cos (X/2)

asked Jan 15, 2021 201k views

3 votes

by Tra

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6 votes

Answer:

0.7746.

Explanation:

cos x/2 = √ [(1 + cos x) / 2]

= √(1 + 1/5) / 2

= √(6/5) / 2)

= √(6/10)

= 0.7746.

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