Categories > trigonometry > Relation between sides and angles > In $\Delta ABC$ , ${{a}^{2}}({{\cos }^{2}}B-{{\cos }^{2}}C)+$ ${{b}^{2}}({{\cos }^{2}}C-{{\cos }^{2}}A)+$ ${{c}^{2}}({{\cos }^{2}}A-{{\cos }^{2}}B)=$

trigonometry

Question: In $\Delta ABC$ , ${{a}^{2}}({{\cos }^{2}}B-{{\cos }^{2}}C)+$ ${{b}^{2}}({{\cos }^{2}}C-{{\cos }^{2}}A)+$ ${{c}^{2}}({{\cos }^{2}}A-{{\cos }^{2}}B)=$


1) 0
2) 1
3) ${{a}^{2}}+{{b}^{2}}+{{c}^{2}}$
4) $2({{a}^{2}}+{{b}^{2}}+{{c}^{2}})$
Solution: Explanation: No Explanation
Relation between sides and angles Solutions of triangles

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