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a number which combined with its inverse results in the identity 1, e.g. 4 × ¼ = 1.
a median of a triangle is a line drawn from a vertex to the middle of the opposite side.
trigonometric ratio, expressed as opposite side divided by adjacent side in a right-angled...
formulae for writing ratios of 90° ± a, 180° ± a and 360° ± a in...
a sequence in which each term is calculated by multiplying the previous term by a common ratio,...