Home
Class 12
MATHS
In any DeltaABC prove by vectors that a^...

In any `DeltaABC` prove by vectors that `a^2=b^2+c^2-2` bc `cos` A.

Promotional Banner

Similar Questions

Explore conceptually related problems

In any DeltaABC prove by vectors that b^2=c^2+a^2-2 ca cos B.

In any triangle ABC, then by vectors, prove that : a=b cos C+c cos B .

In any triangle ABC, then by vectors, prove that : c^2=a^2+b^2-2ab cos C .

In any triangle ABC, prove that cos A= frac{b^2+c^2-a^2}{2bc} .

In DeltaABC, prove that cosA=(b^2+c^2-a^2)/(2b c) by vector method.

In any DeltaABC, 2 [bc cos A + ca cos B+ ab cos C]=

In a triangleABC , prove by vector method that cos2A+cos2B+cos2Cge(-3)/(2) .

In any DeltaABC , prove that a^(3)cos(B-C)+b^(3)cos(C-A)+c^(3)cos(A-B)=3abc

In any triangle ABC, prove that : b^2 sin 2C + c^2 sin 2B = 2 bc sin A .

In any triangle ABC, prove that : (b^2-c^2) cot A + (c^2-a^2)cot B +(a^2-b^2)cotC=0 .