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OpenStudy (anonymous):
show that 2sin²θ-1 = sin²θ-cos²θ for 11pi/6
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OpenStudy (primeralph):
Plug in.
OpenStudy (anonymous):
just plug in 11pi/6 into theta?
OpenStudy (primeralph):
Yeah.
OpenStudy (primeralph):
But formally............
OpenStudy (primeralph):
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