If cosx/a=cos(x+y)/b=cos(x+2y)/c=cos(x+3y)/d. Then b+d/a+c=?

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If cosx/a=cos(x+y)/b=cos(x+2y)/c=cos(x+3y)/d. Then b+d/a+c=?

If cosx/a=cos(x+y)/b=cos(x+2y)/c=cos(x+3y)/d. Then b+d/a+c=?

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