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[" Let "0<=a,b,c,d<=pi," where "b" and "...

[" Let "0<=a,b,c,d<=pi," where "b" and "c" are not complementary,such that "],[2cos a+6cos b+7cos c+9cos d=0" and "2sin a-6sin b+7sin c-9sin d=0," then the value of "],[3(cos(a+d))/(cos(b+c))" is "]

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