Question

cos a = 4/21, find a.
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Answer 1

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Answer 2

The value of a is $79.01^{\circ}$

Step-by-step explanation:

Given : $Cos a = \frac{4}{21}$

To find : Value of a

Solution:

$Cos a =\frac{4}{21}$

$a=cos^{-1}(\frac{4}{21})$

$a=79.01^{\circ}$

Hence The value of a is $79.01^{\circ}$

#Learn more:

Prove that : sin 21°cos 9º - Cos 84° cos 6° = 1/4​

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