1.

If A + B + C = 0, then prove that ∣∣∣∣1cos Ccos Bcos C1cos Acos Bcos A1∣∣∣∣=0

Answer»

If A + B + C = 0, then prove that ∣∣
∣
∣
1cos Ccos Bcos C1cos Acos Bcos A1∣∣
∣
∣
=0



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