sin²45°-cos60°- tan45°分之cos30° +2sin²60°乘tan60°

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sin²45°-cos60°-tan45°分之cos30°+2sin²60°乘tan60°sin²45°-cos60°-tan45°分之cos30°+2sin²

sin²45°-cos60°- tan45°分之cos30° +2sin²60°乘tan60°
sin²45°-cos60°- tan45°分之cos30° +2sin²60°乘tan60°

sin²45°-cos60°- tan45°分之cos30° +2sin²60°乘tan60°
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