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1、南阳市十一中一年级数学学科导学2011/6/17编制人:钟秀旺同角三角函数的基本关系式（第二课时）教学目的：通过运用公式的训练过程，培养学生解决三角函数求值、化简、恒等式证明的解题技能，提高运用公式的灵活性；教学重点：同角三角函数的基本关系.教学难点：(1)已知某角的一个三角函数值，求它的其余各三角函数值时正负号的选择；(2)三角函数式的化简；(3)证明三角恒等式．学习过程：一、复习引入：同角三角函数的基本关系公式:二、讲解范例：例1已知例2求证：otherstaffoftheCentre.Duringthewar,Zhuwas
2、transferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMarch,hehasbeentheNorthwestOfficeoftheFederationofStateenterprisesM
3、inister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministersand-5-南阳市十一中一年级数学学科导学2011/6/17编制人:钟秀旺例3已知是方程的两根（）.求值：例4已知，求例5消去式子中的例6已知三、、课堂练习：1．已知cot=2，求α的其余三个三角函数值．otherstaffoftheCentre.Duringthewar
4、,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMarch,hehasbeentheNorthwestOfficeoftheFederationofStateenter
5、prisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministersand-5-南阳市十一中一年级数学学科导学2011/6/17编制人:钟秀旺2．已知：且，试用定义求的其余三个三角函数值．3．已知角的终边在直线y=3x上，求sin和cos的值．四.课堂练习1．已知，，则等于（）A．B．C．D．2．若，则的值是（）A．－2B．
6、2C．±2D．3．化简otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMarch,hehasbeen
7、theNorthwestOfficeoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministersand-5-南阳市十一中一年级数学学科导学2011/6/17编制人:钟秀旺4．化简，其中为第二象限角．5．已知，求的值．6．已知是三角形的内角，，求值．othersta
8、ffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingi
