2022届高三鄂东南三校联考化学答案

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写作第一节One possible versionDear Miss janeI'm Li Hua, chairman of the Students'Union. I am writing to ask you for a favorAs you know, all the students in Senior 3 are busy preparing for their college entrance examination. To keepthem better motivated, we intend to shoot some inspirational videos, where teachers and students are expected togive them some encouragement and best wishes within 2 minutes. As the most respected and loved teacher, you arethe very person we d like to turn toYour timely reply will be greatly appreciatedoursLi H

sIn a )=2,2(sina cosa)=y2,sina cosa=,两边平方得1 sin2a=,∴sin2=9