作业帮为什么sin²(x+π/4)-cos²(x+π/4)] =2sin²(x+π/4)-1就你之前解答的那道三角函数题.
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/07 01:43:08
![为什么sin²(x+π/4)-cos²(x+π/4)] =2sin²(x+π/4)-1就你之前解答的那道三角函数题.](/uploads/image/z/1801760-32-0.jpg?t=%E4%B8%BA%E4%BB%80%E4%B9%88sin%26%23178%3B%28x%2B%CF%80%2F4%29-cos%26%23178%3B%28x%2B%CF%80%2F4%29%5D+%3D2sin%26%23178%3B%28x%2B%CF%80%2F4%29-1%E5%B0%B1%E4%BD%A0%E4%B9%8B%E5%89%8D%E8%A7%A3%E7%AD%94%E7%9A%84%E9%82%A3%E9%81%93%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E9%A2%98.)
为什么sin²(x+π/4)-cos²(x+π/4)] =2sin²(x+π/4)-1就你之前解答的那道三角函数题.
为什么sin²(x+π/4)-cos²(x+π/4)] =2sin²(x+π/4)-1
就你之前解答的那道三角函数题.
为什么sin²(x+π/4)-cos²(x+π/4)] =2sin²(x+π/4)-1就你之前解答的那道三角函数题.
sin²(x+π/4)-cos²(x+π/4)] =2sin²(x+π/4)-1
因为cos²(x+π/4)] =1-sin²(x+π/4)
所以sin²(x+π/4)-cos²(x+π/4)] =2sin²(x+π/4)-1