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If $\displaystyle{F(x) = \int_{6}^{x} \dfrac{1}{t} \, dt }$ , then $\displaystyle{ F'(x) = }$

If $\displaystyle{F(x) = \int_{x}^{15} \dfrac{1}{t} \, dt }$ , then $\displaystyle{ F'(x) = }$

If $\displaystyle{ F(x) = \int_{5}^{{x^{6}}} \dfrac{1}{t} \, dt }$ , then $\displaystyle{ F'(x) = }$

If $\displaystyle{ F(x) = \int_{2 + \cos x}^{x^2 + 1} \dfrac{1}{t} \, dt }$ , then $\displaystyle{ F'(x) = }$

You can earn partial credit on this problem.