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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(2)\"><div class=\"download_card\"><div class=\"card_nr card_nr_lb\"><h4 class=\"card_bt\">正切和余切教案</h4><div class=\"download_card_msg\">相应的余切值要增加一些.这里取加还是取减,学生极易出错.    三、教学步骤    (一)明确目标    1.结合图6-12说明:什么是∠A的正切、余切?因为这是本章最重要的概念,因此要求全体学生掌握.这里不妨提问成绩较差的学生,以检查学生掌握的情况.    2.一个锐角的正切(余切)与其余角的余切(正切)之间具有什么关系?并写出表达式.    答:tgA=ctg(90°-A),ctgA=tg(90°-A).    3.∠A的正切值与余切值具有什么关系,请用式子表达?    4.结合2、3中复习的内容,配。下面小编给大家分享正切和余切教案，希望能帮助到大家。 正切和余切教案文档下载网址链接：</div></div><div class=\"download_card_btn download_card_btn_lb\"><div class=\"content_box_tj\"><span>推荐度：</span><img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\"></div><div class=\"downlod_btn_right demo_tc downlod_btn_right_lb\"><em class=\"downlod_icon\"></em>点击下载文档<span>文档为doc格式</span></div> </div></div></a>';
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