円に内接する四角形と三角比【超わかる！高校数学Ⅰ・a】～授業～三角比＃２５
Synopsis
向かい合う角の和 = 180° ・cos(180°－θ) = － cosθ ・対角線の長さや四角形の角の cos の値は、対角線で分割される２つの三角形 ...
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