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Homework Statement
the function f(x)=tan(3^x) has one zero in the interval [0,1.4]. The derivative at this point is
The Attempt at a Solution
f'(x)= sec^2(3^x)*x3^(x-1) and i really cant seem to get a zero from that because i really dont know where to start and if im misinterpreting the problem please tell me that. Thanks