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Let 0 le a,b,c,d le piwhere b,c are not complementary such that 2cosa + 6cos b + 7cosc + 9cosd = 0 and 2sina-6sinb + 7 sinc-9sind=0 .Then the value of (cos(a+d))/(cos(b+c)) = |
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Answer» `1//3` |
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