Elementary Functions Double-angle & power-reduction identities
(1+2cos2x+cos2 2x) = 1 4 (1+2cos2x+(1+cos4x 2)) We may simplify the last expression by using the common denominator 8 and so write: cos4 x= 1 8 (3+4cos2x+cos4x)): Smith (SHSU) Elementary Functions 2013 7 / 17 Sum and Di erence Formulas In the next presentation we look at half-angle formulas. ................
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