2022年人教A版高中数学必修四1.31《三角函数的诱导公式》导学案 .pdf
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1、名师精编优秀教案1.3.1 诱导公式(1)学习目标1.借助单位圆,推导出正弦,余弦的诱导公式.2.正确运用诱导公式将任意角的三角函数化为锐角的三角函数,并解决有关三角函数求值,化简和恒等式证明问题.学习过程一、课前准备(预习教材P23 P27,找出疑惑之处)如何求 sin750 o,cos1080o,tan780 o,sin49,cos25的值二、新课导学 探索新知问题 1:如何把任一角的三角函数的求值问题转化为0o 360o间三角函数的求值问题?问题 2:已知任意角的终边与单位圆相交于P(x,y),求 P关于 x 轴,y 轴,原点对称的三个点的坐标.问题3:如果角的终边与角的终边关于原点对称
2、,那么与的三角函数值之间有什么关系?问题 4:如果角的终边与角的终边关于x 轴对称,那么与的三角函数值之间有什么关系?问题 5:如果角的终边与角的终边关于y 轴对称,那么与的三角函数值之间有什么关系?问题 6:你能概括上述诱导公式吗?典型例题例 1:求值(1)67sin;(2)411cos;(3)tan(-1560 o)名师精编优秀教案变式训练:求值(1))1200sin(;(2)945tan;(3)647cos例 2:已知336cos,求65cos的值.变式训练:已知336cos,求6sin65cos2的值。动手试试1、对于诱导公式中的角,下列说法正确的是()A一定是锐角B02C一定是正角
3、D是使公式有意义的任意角2、若,2,53cos则2sin的值是()A53 B53 C 54 D 543、已知29cossin4cossin3,则tan=4、求 cos(2640)+sin1665 的值文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4
4、L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q
5、4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4
6、Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X
7、4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4
8、X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X
9、4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4
10、X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2名师精编优秀教案三、小结反思将任意角的三角函数化为锐角的三角函数的算法流程为:任意角360)360,270180)270,180180)180,90)90,0)360,0学习评价 当堂检测(时量:5 分钟满分:10 分)计分:1、)420tan()60sin(240tan225cos的值是()A、2322 B、2322C、6322 D、63222、已知149tan239sin,31cos则a=()A、aa21 B、21aC、aaa2 D、21a3、)2cos()2si
11、n(21等于()()Asin2 cos2 Bcos2sin2 C(sin2 cos2)D sin2+cos2 4、若atan,则3cos5sin _ _5、化简:)(cos)5sin()4sin()3(sin)(cos)4cos(222_ _文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD
12、2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:CD2R3A10T10X2 HJ4X4X4Q4L2 ZH4H8O10D8Z2文档编码:C
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