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cos4 Θ − sin4 Θ = 2/3
cos4 Θ − sin4 Θ = (cos2 Θ + sin2 Θ) (cos2 Θ − sin2...
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cos2 Θ + sin2 Θ = 1
cos2 Θ = 1 − sin2 Θ
a2 − b2 = (a + b)(a − b)
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