Easy Trigonometry

Geometry Level 1

(1cosasinacosa)(1cosa+sinacosa)=?\left( \dfrac1{\cos a} - \dfrac{\sin a}{\cos a} \right) \left( \dfrac1{\cos a} + \dfrac{\sin a}{\cos a} \right) = \, ?

Assume a2nπ±π2. a \neq 2n\pi \pm \dfrac{\pi}{2}.

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