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OpenStudy (anonymous):
Simplify: \[2\cos ^{2}25 degrees-1\]
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OpenStudy (raden):
use the identity : 2 cos^2 (x) - 1 = cos(2x)
OpenStudy (raden):
in this case, x = 25
OpenStudy (anonymous):
thank you.
OpenStudy (raden):
welcome
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