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How do you prove $1-[2sin^2 (4x)]$ ?

1 Answer

Jun 27, 2015

Prove : $1 - 2sin^2 (4x)$

Explanation:

Use the trig identity: $cos 2a = 1 - 2sin^2 a$

$1 - 2sin^2 (4x) = cos 8x$

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