1.

If \({\rm{cos}}\left( {{\rm{\alpha }} + {\rm{\beta }}} \right) = \frac{3}{5},\;{\rm{sin}}\left( {{\rm{\alpha }} - {\rm{\beta }}} \right) = \frac{5}{{13}}\;\)and \(0 < \alpha ,{\rm{\;}}\beta < \frac{\pi }{4}\), then tan 2α is equal to:

A. \(\frac{{63}}{{52}}\)
B. \(\frac{{63}}{{16}}\)
C. \(\frac{{21}}{{16}}\)
D. \({\rm{\;}}\frac{{33}}{{52}}\)
Answer» C. \(\frac{{21}}{{16}}\)


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