(1) 2*tan(x/2)/(1+tan(x/2)^2) https://www.wolframalpha.com/input?key=&i=2*tan%28x%2F2%29%2F%281%2Btan%28x%2F2%29%5E2%29&lang=ja (1-tan(x/2)^2)/(1+tan(x/2)^2) https://www.wolframalpha.com/input?key=&i=%281-tan%28x%2F2%29%5E2%29%2F%281%2Btan%28x%2F2%29%5E2%29&lang=ja (2)のグラフがでました。 sinx+cosx,tanx/2 https://www.wolframalpha.com/input?key=&i=sinx%2Bcosx%2Ctanx%2F2&lang=ja -π<x<π/2,y=sinx+cosx-tanx/2 https://www.wolframalpha.com/input?key=&i=-%CF%80%3Cx%3C%CF%80%2F2%2Cy%3Dsinx%2Bcosx-tanx%2F2&lang=ja
(1)
2*tan(x/2)/(1+tan(x/2)^2)
https://www.wolframalpha.com/input?key=&i=2*tan%28x%2F2%29%2F%281%2Btan%28x%2F2%29%5E2%29&lang=ja
(1-tan(x/2)^2)/(1+tan(x/2)^2)
https://www.wolframalpha.com/input?key=&i=%281-tan%28x%2F2%29%5E2%29%2F%281%2Btan%28x%2F2%29%5E2%29&lang=ja
(2)のグラフがでました。
sinx+cosx,tanx/2
https://www.wolframalpha.com/input?key=&i=sinx%2Bcosx%2Ctanx%2F2&lang=ja
-π<x<π/2,y=sinx+cosx-tanx/2
https://www.wolframalpha.com/input?key=&i=-%CF%80%3Cx%3C%CF%80%2F2%2Cy%3Dsinx%2Bcosx-tanx%2F2&lang=ja