cos(a+π/6)=-4/5 sina=?
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cos(a+π/6)=-4/5 sina=?
cos(a+π/6)=-4/5 sina=?
cos(a+π/6)=-4/5 sina=?
sin(a+π/6)=+-3/5
sina=sin(a+π/6-π/6)=sin(a+π/6)cosπ/6-sinπ/6cos(a+π/6)
sin(a+π/6)=3/5,sina=3/5x√3/2-1/2x(-4/5)=(3√3+4)/10
sin(a+π/6)=-3/5,sina=-3/5x√3/2-1/2x(-4/5)=(-3√3+4)/10
cos(a+π/6)=-4/5 sina=?
若a∈(0,π/2),cos(a+π/6)=-4/5,sina,
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