9 March, 15:35
9 March, 16:52
A^2 - b^2 = (a - b) (a + b);
cos^4x-sin^4x = (cos^2x + sin^2x) (cos^2x - sin^2x) = 1 * cos2x = co2x.
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» Verify cos^4x-sin^4x=cos2x