1.

Show that : (i) sinAsin(B—C)+sinBsin(C—A)+sinCsin(A—B)=0 (ii) sin(B—C)cos(A—D)+sin(C—A)cos(B—D)+sin(A—B)cos(C—D)=0

Answer»

Show that :
(i) sinAsin(BC)+sinBsin(CA)+sinCsin(AB)=0
(ii) sin(BC)cos(AD)+sin(CA)cos(BD)+sin(AB)cos(CD)=0



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