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Sec A = 2 cos A is true for A = ______. - Mathematics

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Question

sec A = 2 cos A is true for A = ______.

Options

  • 30°

  • 45°

  • 60°

MCQ
Fill in the Blanks
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Solution

sec A = 2 cos A is true for A = 45°.

Explanation:

sec A = 2 cos A

`1/(cos A)` = 2 cos A

⇒ 1 = 2 cos2A

⇒ `1/2` = cos2A

⇒ cos A = `1/sqrt2`

= cos 45

A = 45°

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