[f(x)]^2-[f(y)]^2=f(x+y)f(x-y) 求f(x)
对任意实数x,y均有\(\left[ f\left( x\right)\right]^2-\left[ f\left( y\right)\right]^2=f\left( x+y\right)f\left( x-y\right)\)成立,求满足条件的f(x) 目测 \ 目测 \ Treenewbee 发表于 2024-4-9 20:06目测 \
是的\(f\left( x\right)=k\sin x和f\left( x\right)=k\sinh x\) 也成立不知道有无其他解
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