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Let $F(x)= f(x^{4})$ and $G(x)=(f(x))^{4}$ . You also know that $a^{3}=10, f(a)=2,f'(a)=15, f'(a^{4})=13$ .
Find $F'(a)=$ and $G'(a)=$ .

You can earn partial credit on this problem.