已知f(x)=x^2+1,求f(m^2-1) ,f [f(2)
问题描述：
已知f(x)=x^2+1,求f(m^2-1) ,f [f(2)
答
f(m²-1) = (m²-1)²+1 = m^4 - 2m² + 2
f[f(2)] = f(2²+1) = f(9) = 9²+1 = 82