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الفعل
قَسَّمَ ; قَسَمَ ; نَصَّفَ ; نَصَّفَ الشَّيْءُ
الصفة
مُنَصَّف
In trigonometry, tangent half-angle formulas relate the tangent of half of an angle to trigonometric functions of the entire angle. The tangent of half an angle is the stereographic projection of the circle onto a line. Among these formulas are the following:
From these one can derive identities expressing the sine, cosine, and tangent as functions of tangents of half-angles: