令u = tan(x/2)
则dx = 2 du/(1 + u²)
sinx = 2u/(1 + u²)
cosx = (1 - u²)/(1 + u²)
tanx = 2u/(1 - u²)
求不定积分万能公式谁知道不定积分中有关三角函数转换成多项式的万能公式?谢谢.
令u = tan(x/2)
则dx = 2 du/(1 + u²)
sinx = 2u/(1 + u²)
cosx = (1 - u²)/(1 + u²)
tanx = 2u/(1 - u²)