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21-05-2020
Mathematics

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

Respuesta :

PollyP52 PollyP52

21-05-2020

Answer:

0.7746.

Step-by-step explanation:

cos x/2 = √ [(1 + cos x) / 2]

= √(1 + 1/5) / 2

= √(6/5) / 2)

= √(6/10)

= 0.7746.

=

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