1.在平面直角坐标系中,已知点O(0.0)A(3.0)B(0.3)C(cosα,sinα)D(-2cosα,-t),其中α∈(π/2,3π/2).(1)若向量AC·向量BC=-1,求(2sin²α+2sinα·cosα)/(1+tanα)的值.(2)若f(α)=向量OC·向量OD-
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/28 15:30:48
![1.在平面直角坐标系中,已知点O(0.0)A(3.0)B(0.3)C(cosα,sinα)D(-2cosα,-t),其中α∈(π/2,3π/2).(1)若向量AC·向量BC=-1,求(2sin²α+2sinα·cosα)/(1+tanα)的值.(2)若f(α)=向量OC·向量OD-](/uploads/image/z/11916406-46-6.jpg?t=1.%E5%9C%A8%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5%E7%82%B9O%EF%BC%880.0%EF%BC%89A%EF%BC%883.0%EF%BC%89B%EF%BC%880.3%EF%BC%89C%EF%BC%88cos%CE%B1%2Csin%CE%B1%EF%BC%89D%28-2cos%CE%B1%2C-t%29%2C%E5%85%B6%E4%B8%AD%CE%B1%E2%88%88%EF%BC%88%CF%80%EF%BC%8F2%2C3%CF%80%EF%BC%8F2%EF%BC%89.%EF%BC%881%EF%BC%89%E8%8B%A5%E5%90%91%E9%87%8FAC%C2%B7%E5%90%91%E9%87%8FBC%3D-1%2C%E6%B1%82%EF%BC%882sin%26%23178%3B%CE%B1%2B2sin%CE%B1%C2%B7cos%CE%B1%29%2F%281%2Btan%CE%B1%29%E7%9A%84%E5%80%BC.%EF%BC%882%EF%BC%89%E8%8B%A5f%28%CE%B1%29%3D%E5%90%91%E9%87%8FOC%C2%B7%E5%90%91%E9%87%8FOD-)
xVnG~*UeʺJ{Kum)Z)M.w$vbpl i?_bn]R}kgvrR/*9ߙ3;4qY'lȷæSe'o]~ccn+w
麐%iE-z5P4CJev͂n`Dc =eǝµw'(?~1E-bHNDUWh$}62-D4$RS7Է?E&<LjHKT9e\uDefX 2b$Ul?N+jǷ"T#t(z,~!A^<*
&h4m{Ox~
la%H[aA21F\Raŗ͊ @`(44|6WotJĦQg6zFfZ`v[xPl2eS5ꜝ2db:S+콀͝ZV 4N}WzrDJ->tb)h