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anonymous
 one year ago
Can you please help me with this trig question
anonymous
 one year ago
Can you please help me with this trig question

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Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1we have this drawing: dw:1438159678788:dw

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1as we can see, we can write: \[\begin{gathered} \cos \alpha > 0 \hfill \\ \sin \beta < 0 \hfill \\ \end{gathered} \]

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1hint: therefore, we can write: \[\Large \begin{gathered} \cos \alpha = \sqrt {1  {{\left( {\sin \alpha } \right)}^2}} = ... \hfill \\ \sin \beta =  \sqrt {1  {{\left( {\cos \beta } \right)}^2}} = ... \hfill \\ \end{gathered} \]

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1furthermore, you have to use this identity: \[\Large \sin \left( {\alpha + \beta } \right) = \sin \alpha \cos \beta + \cos \alpha \sin \beta \]
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