[微分]請問一題微分

[nomindman ( ㄍㄕㄆ)]

suppose that if f g are both convex
let h(x)= max ( f(x) , g(x) )
then h(x) is convex or concave  Explain your result ??


    這題該怎麼想欸....請會的版大指點一下迷津八  :)

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