Answer
$$\frac{1}{2}e^{y^2}+c. $$
Work Step by Step
Let $u=y^2$, then $du=2ydy$. Now, we have
$$\int ye^{y^2}dy=\frac{1}{2}\int e^udu=\frac{1}{2}e^u+c=\frac{1}{2}e^{y^2}+c. $$
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