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20ashea
A is the answer!!!!!!!!!!!!!!!!
altavistard
Focus on arctan 2 first.  This fact tells us that opp = 2 and adj = 1, so that the hyp is sqrt(4+1), or sqrt(5).

The sine of (arctan (2) ) is opp/hyp.  We know that opp=2 and hyp = sqrt(5).  
                                                           2sqrt(5)
Thus, sin (arctan (2)) = 2/sqrt(5)   or ------------
                                                                 5

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