1.

Prove that: (i) cos(A+B+C)+cos(−A+B+C)+cos(A−B+C)+cos(A+B−C)sincos(A+B+C)+sincos(−A+B+C)+sincos(A−B+C)−sin(cos(A+B−C)) (ii) sin(B−C)cos(A−D)+sin(C−A)cos(B−D)+sin(A−B)cos(C−D)=0

Answer»

Prove that:
(i) cos(A+B+C)+cos(A+B+C)+cos(AB+C)+cos(A+BC)sincos(A+B+C)+sincos(A+B+C)+sincos(AB+C)sin(cos(A+BC))
(ii) sin(BC)cos(AD)+sin(CA)cos(BD)+sin(AB)cos(CD)=0



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