1#Properties_Of_Triangles Show that Cos² (A/2) + Cos² (B/2) + Cos² (C/2) = 2 + (r /2R)

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Show that b.cos²(C/2) + c.cos²(B/2) = s | PROPERTIES OF TRIANGLES | INTERMEDIATE 1st YEAR Show that b.cos²(C/2) + c.cos²(B/2) = s | PROPERTIES OF TRIANGLES | INTERMEDIATE 1st YEAR
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If `(r)/(r _(1))= (r_(2))/(r _(3)),` then show that `c=90^(@).` If `(r)/(r _(1))= (r_(2))/(r _(3)),` then show that `c=90^(@).`