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For alpha=pi/7 which of the following h...

For `alpha=pi/7` which of the following hold(s) good? (a) `tanalphatan2alphatan3alpha=tan3alpha-tan2alpha-tanalpha` (b)`cos e calpha=cos e c2alpha+cos e c4alpha` (c)`cosalpha-cos2alpha+cos3alpha=1/2` (d)`8cosalphacos2alphacos4alpha=1`

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