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dpaIncBest ResponseYou've already chosen the best response.0
HINT: \(\large sin(x/2)=\pm \sqrt{\frac{1cosx}{2}} \)
 one year ago

dpaIncBest ResponseYou've already chosen the best response.0
can you figure out what x = ??? first?
 one year ago

dpaIncBest ResponseYou've already chosen the best response.0
find x: \(\large \frac{7\pi}{8}=\frac{x}{2} \)
 one year ago

dpaIncBest ResponseYou've already chosen the best response.0
ok... so plugging that into the half angle formula: \(\large sin(\frac{7\pi}{8})=sin(\frac{\frac{7\pi}{4}}{2})=\pm \sqrt{\frac{1cos(\frac{7\pi}{4})}{2}} \)
 one year ago

dpaIncBest ResponseYou've already chosen the best response.0
can you take it from here?
 one year ago
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