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Math Help - Expressing

  1. #1
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    Expressing

    Given that cotA=K and that A is acute, express sec2A in terms of K
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  2. #2
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    Hello Punch
    Quote Originally Posted by Punch View Post
    Given that cotA=K and that A is acute, express sec2A in terms of K
    Here are the formulae you'll need:
    If A is acute, \cot A = \frac{\text{adjacent}}{\text{opposite}}=\frac{K}{1  }, so you can find \cos A using Pythagoras' Theorem.

    \sec 2A = \frac{1}{\cos 2A}

    \cos2A = 2 \cos^2A -1
    Can you complete it now?

    Grandad
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  3. #3
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    I tried playing around with formulas and actually solved it using formulas, thanks for your help!
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