3) f(X 4)∠DAB=60°,AD=AA1

问题描述:

3) f(X 4)∠DAB=60°,AD=AA1
(a-b)/sin(a-b)1×2 1\2×3 1\3×4 …… 1\49×50

x=1 rcosA,y=-1 rsinA,r>0,Ax2 = (-5)2 = 25因为B=因为x=1 rcosA,y=-1 rsinA,r>0,A