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(x/8+x/7)'The calculation above is a derivative of the function f (x)
(x/8)'+(x/7)'
((x)'*8-(x*(8)'))/(8^2)+(x/7)'
(1*8-(x*(8)'))/(8^2)+(x/7)'
(1*8-(x*0))/(8^2)+(x/7)'
((x)'*7-(x*(7)'))/(7^2)+1/8
(1*7-(x*(7)'))/(7^2)+1/8
(1*7-(x*0))/(7^2)+1/8
15/56
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