sin^ 2 π/12-1/3=?
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sin^ 2 π/12-1/3=?
sin^ 2 π/12-1/3=?
sin^ 2 π/12-1/3=?
sin^ 2 π/12-1/3
=(1-sinπ/6)/2-1/3
=1/4-1/3
=-1/12
1/6 ..
sin^ 2 π/12-1/3=?
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