怎么由k=π-arctan1/2
arctan1/2+arctan1/5+arctan1/8=
arctan1/3+arctan1/2+arctan1=几,
求证arctan1/2+arctan1/5+arctan1/8=pai/4
A=arctan1/2
证明arctan1/2+arctan1/3=45°
方程8(sinx)^2=3sin2x-1的解集是______ (答案是x=kπ+arctan1/3,k∈Z 请说明原因)
arctan1/2+arctan1/5+arctan1/3
证明当x>0,arctanx+arctan1/x=π/2
证明恒等式:arctanx+arctan1/x=π/2(x>0)
求证arctan1+arctan2+arctan3=π.
直线x=5与直线x+2y-6=0的夹角为( ) A.arctan1/2 B.π/2+arctan1/2 C.π/2-ar
arctan1/2+arctan1/3 解答题