sin2,cos2\sin^2,\cos^2sin2,cos2
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sin2x=(1−cos2x)/2\sin^2 x=(1-\cos 2x)/2sin2x=(1−cos2x)/2, cos2x=(1+cos2x)/2\cos^2 x=(1+\cos 2x)/2cos2x=(1+cos2x)/2. Halvvinkelsformler reduserer potens.
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