f(x)=sinx/|cosx|在区间{-π,π}内的图像是[-π,-π/2] f(x)=sinx/(-cosx)=-tanx [-π/2,0]f(x)=sinx/cosx=tanx (可我看正于弦图像,觉得tanx是负号~,我理解是在这个区间内,sinx小于0,cosx大于0,所以tanx小于0) [0,π/2]f(x)
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![f(x)=sinx/|cosx|在区间{-π,π}内的图像是[-π,-π/2] f(x)=sinx/(-cosx)=-tanx [-π/2,0]f(x)=sinx/cosx=tanx (可我看正于弦图像,觉得tanx是负号~,我理解是在这个区间内,sinx小于0,cosx大于0,所以tanx小于0) [0,π/2]f(x)](/uploads/image/z/13386458-2-8.jpg?t=f%28x%29%3Dsinx%2F%7Ccosx%7C%E5%9C%A8%E5%8C%BA%E9%97%B4%7B-%CF%80%2C%CF%80%7D%E5%86%85%E7%9A%84%E5%9B%BE%E5%83%8F%E6%98%AF%5B-%CF%80%2C-%CF%80%2F2%5D+f%28x%29%3Dsinx%2F%28-cosx%29%3D-tanx+%5B-%CF%80%2F2%2C0%5Df%28x%29%3Dsinx%2Fcosx%3Dtanx+%EF%BC%88%E5%8F%AF%E6%88%91%E7%9C%8B%E6%AD%A3%E4%BA%8E%E5%BC%A6%E5%9B%BE%E5%83%8F%2C%E8%A7%89%E5%BE%97tanx%E6%98%AF%E8%B4%9F%E5%8F%B7%7E%2C%E6%88%91%E7%90%86%E8%A7%A3%E6%98%AF%E5%9C%A8%E8%BF%99%E4%B8%AA%E5%8C%BA%E9%97%B4%E5%86%85%2Csinx%E5%B0%8F%E4%BA%8E0%2Ccosx%E5%A4%A7%E4%BA%8E0%2C%E6%89%80%E4%BB%A5tanx%E5%B0%8F%E4%BA%8E0%EF%BC%89+%5B0%2C%CF%80%2F2%5Df%28x%29)
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