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Sergeeva-Olga [200]
3 years ago
14

The exact vaule of cos(247.5 degrees)

Mathematics
1 answer:
Leni [432]3 years ago
8 0
cos(247.5 deg)=cos( \frac{495deg}{2})
                         =  - \sqrt{ \frac{1+cos(495deg)}{2} }  
                         = -\sqrt{ \frac{1- \frac{ \sqrt{2} }{2} }{2} } 
                         =  \frac{ \sqrt{2- \sqrt{2} } }{2}
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