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Linear combinations where Angle sum and difference identities Tangents of sums of finitely many terms Let xi = tan(?i ), for i = 1, ..., n. Let ek be the kth-degree elementary symmetric polynomial in the variables xi, i = 1, ..., n, k = 0, ..., n. Then the number of terms depending on n. Double-angle formulæ The double-angle formula can also be used to find Pythagorean triples. If (a, b, c) are the lengths of the sides of a right triangle, then (a2 ? b2, 2ab, c2) also form a right triangle, where angle B is the angl
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submitted by edison (4866 m) on 28 Mar 2007 16:50:06 IST (10 comments 2331 views)
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