Solve cosine(Pi/8) using the half angle identity

  1. profile image44
    KBoyceposted 8 years ago

    Solve cosine(Pi/8) using the half angle identity

    Use Trig Identities

  2. Ben Evans profile image73
    Ben Evansposted 7 years ago

    Cos(Pi/8)=[(1+Cos{Pi/4})/2]^1/2

    Cos(Pi/4)=SQRT2/2=.707

    Therefore Cos(Pi/8)=[(1+.707)/2]^1/2=.924

 
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