Y=sin(x+6/π)+sin(x-6/π)+cosx

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Y=sin(x+6/π)+sin(x-6/π)+cosx
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Y=sin(x+6/π)+sin(x-6/π)+cosx
Y=sin(x+6/π)+sin(x-6/π)+cosx

Y=sin(x+6/π)+sin(x-6/π)+cosx
Y=sin(x+6/π)+sin(x-6/π)+cosx
=sinxcosπ/6+cosxsinπ/6+sinxcosπ/6-cosxsinπ/6+cosx
=√3sinx+cosx
=2(√3/2*sinx+1/2*cosx)
=2sin(x+π/6)

= =。 推公式?? 慢慢算呗