sin30°+cos45°乘以sin45°-tan602sin²60°乘以tan45°+cos30°乘以tan30°
问题描述:
sin30°+cos45°乘以sin45°-tan60
2sin²60°乘以tan45°+cos30°乘以tan30°
答
sin30°+cos45°乘以sin45°-tan60
2sin²60°乘以tan45°+cos30°乘以tan30°