" (i) "a^(2)+b^(2)+c^(2)=2(bc cos A+ca cos B+

In Delta ABC prove that a^(2)+b^(2)+c^(2)=2(bc cos A+ca cos B+ab cos C)

In Delta ABC, prove that a^(2)+b^(2)+c^(2)=2(bc cos A+ca cos B+ab cos C)

In any Delta ABC, prove that :a^(2)+b^(2)+c^(2)=2(bc cos A+ca cos B+ab cos C)

In any DeltaABC , prove that : a^2 +b^2 +c^2 = 2 (bc cos A + ca cos B + ab cos C) .

Prove that a^(2)+b^(2)+c^(2)=2(ab cos C +bc cosA +ca cos B)

If : A+B+C=pi, "then" : 1-cos^(2) A-cos^(2)B-cos^(2)C= A) 2 cos A * cos B * cos C B) 2 sin A * cos B * cos C C) 2 cos A * sin B * cos C D) 2 cos A * cos B * sin C

If Delta represents the area of acute angled triangle ABC,then sqrt(a^(2)b^(2)-4Delta^(2))+sqrt(b^(2)c^(2)-4Delta^(2))+sqrt(c^(2)a^(2)-4Delta^(2))= (a) a^(2)+b^(2)+c^(2)(b)(a^(2)+b^(2)+c^(2))/(2) (c) ab cos C+bosA+ca cos B(d)ab sin C+bc sin A+ca sin B

If in a triangle ABC, (bc)/(2 cos A) = b^(2) + c^(2) - 2bc cos A then prove that the triangle must be isosceles.

If in a triangle ABC, (bc)/(2 cos A) = b^(2) + c^(2) - 2bc cos A then prove that the triangle must be isosceless

If in a triangle ABC, (bc)/(2 cos A) = b^(2) + c^(2) - 2bc cos A then prove that the triangle must be isosceles.