f(x)=cos²(π/6)+sinπ/6cosπ/6
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f(x)=cos²(π/6)+sinπ/6cosπ/6f(x)=cos²(π/6)+sinπ/6cosπ/6f(x)=cos²(π/6)+sinπ/6cosπ/6f(x)
f(x)=cos²(π/6)+sinπ/6cosπ/6
f(x)=cos²(π/6)+sinπ/6cosπ/6
f(x)=cos²(π/6)+sinπ/6cosπ/6
f(x)=[cos(派/6)]^2+sin(派/6)cos(派/6)
=[(根号3)/2]^2+[(1/2)*(根号3)/2]
=(3/4)+(根号3)/4
=(3+根号3)/4.