高中数学题求解,题目见下图。
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sin(A+π/6)=1/3
cos(A+π/6)=2√2/3
sin(A+π/6)=cos(A-π/3)=1/3
sin(A-π/3)=2√2/3
sin(2A-π/6)=sin[(A+π/6)+(A-π/3)]=sin(A+π/6)cos(A-π/3)+cos(A+π/6)sin(A-π/3)
=1/3*1/3+2√2/3*2√2/3=1
cos(A+π/6)=2√2/3
sin(A+π/6)=cos(A-π/3)=1/3
sin(A-π/3)=2√2/3
sin(2A-π/6)=sin[(A+π/6)+(A-π/3)]=sin(A+π/6)cos(A-π/3)+cos(A+π/6)sin(A-π/3)
=1/3*1/3+2√2/3*2√2/3=1
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