Question

sec a + tan a = x find the value of Cos A​

Answer 1

Answer:

sec a + tan a = x ....(1) then

sec a - tan a = 1/x ....(2)

add 1 and 2

2 seca = x + 1/x

$seca \: = \frac{ { x}^{2} + 1}{2x}$

subtract 1 and 2

2tana = x - 1/x

$tana \: = \frac{ {x}^{2} - 1}{2x}$

$cos \: a \: = \frac{1}{seca}$

$cos \: a \: = \frac{2x}{ { x}^{2} + 1 }$

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Answer 2

Explanation:

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