(sin45-cos60)/(tan²30-tan45)+1/3sin60tan30=(√2/2-1/2)/(1/3-1)+1/3 ×√3/2×√3/3=(1/2-√2/2)×3/2+1/6=3(1-√2)/4+1/6=(9-9√2+2)/12 =(11-9√2)/12
