sin²45°-cos60°- tan45°分之cos30° +2sin²60°乘tan60°
问题描述:
sin²45°-cos60°- tan45°分之cos30° +2sin²60°乘tan60°
答
sin²45°-cos60°- tan45°分之cos30° +2sin²60°乘tan60°
=(根号3/2+3根号3/2)/(1/2-1/2-1)=-2根号3