Question

$\cos( \alpha ) \: - \sin( \alpha ) = \frac{1}{5} then \: \\ \\ cos( \alpha ) + \sin( \alpha ) = |?|$




$\sin(2 \alpha ) = \\ \\ \\ \\ \\ \cos(2 \alpha ) = \\ \\ \\ \\ \cos( \alpha) =$
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Answer 1

Answer:

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