根号下(tan^2 30°-2tan30°+1) +│cos30°-1│RT,根号下的式子为:tan^2 30°-2tan30°+1
问题描述:
根号下(tan^2 30°-2tan30°+1) +│cos30°-1│
RT,根号下的式子为:tan^2 30°-2tan30°+1
答
根号下(tan^2 30°-2tan30°+1) +│cos30°-1│
=根号下(tan 30°-1)^2 +│cos30°-1│
=1-tan 30° +1-cos30°
=2-tan 30° -cos30°
=2-√3/3-√3/2
=2-5√3/6