求证:arctan 1/2+arctan 1/5+arctan 1/8=π/4
求证:arctan 1/2+arctan 1/5+arctan 1/8=π/4
arctan(1/3)+arctan(1/2)的值为?
arctan(-2)+arctan(-3)=?
证明:arctan(n+1)-arctan(n)=arctan{1/[1+n(n+1)]}
求值:sin[1/2arctan(-4/3)]
y=arctan(x^2+1)
arctan-1等于多少
arctan(n+1)-arctan(n) 如何计算 答案是+π/4
arctan(-1)=-π/4,怎么算的?
arctan(tan5π/4)为什么等于arctan(-1) tan(5π/4)=tan(π+π/4)不应等于arcta
计算:arctan(1-x)+arctan(1+x)的值
arctan(A/2)+arctan(A/5)=30