is in the 3rd quadrant, but  is in the 2nd quadrant, and has a REFERENCE angle of . 

Thus,  

Answer by ikleyn(52787)   (Show Source): You can put this solution on YOUR website!
 .

The angle  is geometrically equivalent to  =  = ,


which, in turn, is geometrically equivalent to

 =  = ,


which, in turn, is simply the same as .


The function sine is periodical with the period of , therefore,


 =  =  =  = .




Solved.







 

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