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The exact vaule of cos(247.5 degrees)
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The exact vaule of cos(247.5 degrees)

User Syd Kerckhove
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1 Answer

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cos(247.5 deg)=cos( (495deg)/(2)) = - \sqrt{ (1+cos(495deg))/(2) } = -\sqrt{ (1- ( √(2) )/(2) )/(2) } = \frac{ \sqrt{2- √(2) } }{2}
User Ajinkya Patil
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