Trigonometry and Complex Numbers - Youth Conway
cos2x cos 2014ˇ2 x = cos4x 1: Solution. We see cos2xmultiple times on the left side, so this motivates us to write the right side as a function of cos2xwith the double angle identity. 2cos2x cos2x cos 2014ˇ2 x = cos4x 1 = 2cos2 2x 2: Now, we can divide by 2 and expand the left side. cos2 2x cos2xcos 2014ˇ2 x = cos2 2x 1: cos2xcos 2014ˇ2 x = 1: ................
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