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QUESTION
Q
If cos4 Θ − sin4 Θ = 2/3, then the value of 1 − 2 sin2 Θ is

Solution

cos4 Θ − sin4 Θ = 2/3 cos4 Θ − sin4 Θ = (cos2 Θ + sin2 Θ) (cos2 Θ − sin2...

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Solution

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Keynote

cos2 Θ + sin2 Θ = 1 cos2 Θ = 1 − sin2 Θ a2 − b2 = (a + b)(a − b)

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