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$ D(y(x)) = D(lntan\sqrt{e^{5x}} )$
$ D(y(x)) = \frac{cos(\sqrt{e^{5x}})}{sin(\sqrt{e^{5x}})} D (tan\sqrt{e^{5x}}) $
$ D(y(x)) = \frac{cos(\sqrt{e^{5x}})}{sin(\sqrt{e^{5x}})} \frac{1}{cos^2 (\sqrt{e^{5x}})} D( \sqrt{e^{5x}}) $
$ D(y(x)) = \frac{cos(\sqrt{e^{5x}})}{sin(\sqrt{e^{5x}})} \frac{1}{cos^2 (\sqrt{e^{5x}}) } \frac{5}{2} \sqrt{e^{5x}} $
$ D(y(x)) = 5 \frac{1}{2 sin(\sqrt{e^{5x}})} \frac{1}{cos (\sqrt{e^{5x}}) } \sqrt{e^{5x}} $
$ D(y(x)) = \frac{5\sqrt{e^{5x}}}{sin(2\sqrt{e^{5x}})}$