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Mick from cannotta
Answers (1)
1. 2 x 67.5 = 135 2. tan 135 = - tan 45 = -1 3. tan 2A = [2tan A]/[1-(tan A)^2] 4. Put A = 67.5 in (3) and get tan135 = [2tan67.5]/[1-(tan67.5)^2] -1 = [2tan 67.5]/[1-(tan 67.5)^2] 5. Let x = tan 67.5. Then, -1 = 2x/[1 - x^2] x^2 - 2x - 1 = 0 By quadratic
