1.

If A,B,C≠(2n+1)π2, then the numerical value of sin(B−C)cosBcosC+sin(C−A)cosCcosA+sin(A−B)cosAcosB is

Answer»

If A,B,C(2n+1)π2, then the numerical value of sin(BC)cosBcosC+sin(CA)cosCcosA+sin(AB)cosAcosB is



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