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Simplify \(\left( \dfrac1{\cos a} - \dfrac{\sin a}{\cos a} \right) \left( \dfrac1{\cos a} + \dfrac{\sin a}{\cos a} \right)\)

 Jun 24, 2020
 #1
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I think this will be the same as this rule:

(a+b)(a-b)=a^2-b^2

 

So, our answer will be

1/cos a minus sin a/cos a

 Jun 24, 2020

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