If f(x)=∑n=0∞cnxnf(x) = \sum_{n=0}^{\infty} c_n x^nf(x)=∑n=0∞cnxn has radius R=5R=5R=5, what is the radius of convergence for g(x)=f(x2)g(x) = f(x^2)g(x)=f(x2)?
R=5R = \sqrt{5}R=5
R=5R = 5R=5
R=52R = 5^2R=52
R=25R = 25R=25