1.

If alpha, beta are two different values of theta which satisfy is bc cos theta cos phi + ac sin theta sin phi=ab, then prove that (b^(2)+c^(2)-a^(2)) cos alpha cos beta+ ac sin alpha sin beta= a^(2)+b^(2)-c^(2).

Answer»


ANSWER :` (a^(2)+B^(2)-C^(2))=RHS`


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