已知函数f(x)=eπx•sin2πx,求f'(x)及f′(1 2 ).已知函数f(x)=eπx•sin2πx,求f'(x)及f′(1 / 2 )

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已知函数f(x)=eπx•sin2πx,求f'(x)及f′(1 2 ).已知函数f(x)=eπx•sin2πx,求f'(x)及f′(1 / 2 )
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已知函数f(x)=eπx•sin2πx,求f'(x)及f′(1 2 ).已知函数f(x)=eπx•sin2πx,求f'(x)及f′(1 / 2 )
已知函数f(x)=eπx•sin2πx,求f'(x)及f′(1 2 ).
已知函数f(x)=eπx•sin2πx,求f'(x)及f′(1 / 2 )

已知函数f(x)=eπx•sin2πx,求f'(x)及f′(1 2 ).已知函数f(x)=eπx•sin2πx,求f'(x)及f′(1 / 2 )
f'(x) = eπ•sin2πx + 2eπ²x•cos2πx
f'(1/2) = eπ•sinπ + eπ²•cosπ = - eπ²