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