A=arctan1/2
A=arctan1/2
arctan1/2+arctan1/5+arctan1/8=
arctan1/3+arctan1/2+arctan1=几,
求证arctan1/2+arctan1/5+arctan1/8=pai/4
证明arctan1/2+arctan1/3=45°
arctan1/2+arctan1/5+arctan1/3
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
arctan1+arctan2+arctan3=
arctan1+arctan2+arctan3=?
arctan1-arctan0=?
证明arctanx+arctan1/x=兀/2 (x>0)