Question

tan30°sin60°+cos^30°-sin^45°tan45°

如题 解答

Answer 1

tan30°sin60°+cos^30°-sin^45°tan45°
=根号3/3*根号3/2-(根号3/2)^2-(根号2/2)^2*1
=1/2-3/4-1/2
=-3/4

Answer 2

tan30°sin60°+cos^30°-sin^45°tan45°
=(1/√3) (√3/2) + (√3/2)^2 - (1/√2)^2
= 1/2+3/4-1/2
=3/4