=1/2+√2/2-√3/3
∵cos(60°) = 1/2sin(45°) =(√2)/2tan(30°) =(√3)/3∴cos60°+ sin45°-tan30°=3/6 + 3(√2)/6 - 2(√3)/6=( 3+3(√2)-2(√3) )/6
