§4.2同角三角函数基本关系及诱导公式INCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\大一轮苏教版\\基础知识自主学习.tif"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\基础知识自主学习.tif"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\基础知识自主学习.tif"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\大一轮苏教版\\知识梳理.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\知识梳理.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\知识梳理.TIF"\*MERGEFORMATINET1．同角三角函数的基本关系(1)平方关系：sin2α＋cos2α＝1.(2)商数关系：＝tanα.2．下列各角的终边与角α的终边的关系角2kπ＋α(k∈Z)π＋α－α图示INCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\大一轮苏教版\\147.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\147.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\147.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\大一轮苏教版\\148.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\148.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\148.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\大一轮苏教版\\149.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\149.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\149.TIF"\*MERGEFORMATINET1与角α终边的关系相同关于原点对称关于x轴对称角π－α－α＋α图示INCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\大一轮苏教版\\150.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\150.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\150.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\大一轮苏教版\\151.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\151.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\151.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\大一轮苏教版\\152.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\152.TIF"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\152.TIF"\*MERGEFORMATINET与角α终边的关系关于y轴对称关于直线y＝x对称3.六组诱导公式组数一二三四五六角2kπ＋α(k∈Z)－απ－απ＋α－α＋α正弦sinα－sinαsinα－sinαcosαcosα余弦cosαcosα－cosα－cosαsinα－sin2α正切tanα－tanα－tanαtanα口诀函数名不变符号看象限函数名改变符号看象限【思考辨析】判断下面结论是否正确(请在括号中打“√”或“×”)(1)sin(π＋α)＝－sinα成立的条件是α为锐角．(×)(2)六组诱导公式中的角α可以是任意角．(×)(3)若cos(nπ－θ)＝(n∈Z)，则cosθ＝.(×)(4)已知sinθ＝，cosθ＝，其中θ∈[，π]，则m<－5或m≥3.(×)(5)已知θ∈(0，π)，sinθ＋cosθ＝，则tanθ的值为－或－.(×)(6)已知tanα＝－，则的值是－.(√)INCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\大一轮苏教版\\考点自测.tif"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\考点自测.tif"\*MERGEFORMATINETINCLUDEPICTURE"F:\\2015\\一轮\\数学\\苏教\\理\\word\\大一轮苏教版\\考点自测.tif"\*MERGEFORMATINET1．已知α是第二象限...
