怎样使f(x)=sinx+cosx=√2*sin(x+π/4)

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怎样使f(x)=sinx+cosx=√2*sin(x+π/4)怎样使f(x)=sinx+cosx=√2*sin(x+π/4)怎样使f(x)=sinx+cosx=√2*sin(x+π/4)f(x)=si

怎样使f(x)=sinx+cosx=√2*sin(x+π/4)
怎样使f(x)=sinx+cosx=√2*sin(x+π/4)

怎样使f(x)=sinx+cosx=√2*sin(x+π/4)
f(x)=sinx+cosx=√2(√2/2sinx+√2/2sinxcosx) -------(提一个√2出来)
=√2(sinxcosπ/4+cosxsinπ/4)-(把(√2/2分别变为cosπ/4,sinπ/4)
=√2*sin(x+π/4) ------------------ (两角和正弦公式)