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OpenStudy (anonymous):
find exact value for cos(pi/16)
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OpenStudy (alexwee123):
use half formula....
OpenStudy (jlastino):
0.98 or you could also do this using identities but it would take much time
OpenStudy (anonymous):
how to use identity?
OpenStudy (anonymous):
0.98 isn't an exact answer, you have to use the half identity
OpenStudy (alexwee123):
|dw:1334469040069:dw|
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