L1:3x+4y-3=0
y=-3/4x+3/4
斜率=-3/4
L2:5x-y+3=0
y=5x+3
斜率=5
两条直线所成锐角正切值
=(k1-k2)/(1+k1k2)
=(-3/4-5)/(1-15/4)
=23/11
tana=23/11
cosa=11/[√(23²+11²)]=11/650
L1:3x+4y-3=0
y=-3/4x+3/4
斜率=-3/4
L2:5x-y+3=0
y=5x+3
斜率=5
两条直线所成锐角正切值
=(k1-k2)/(1+k1k2)
=(-3/4-5)/(1-15/4)
=23/11
tana=23/11
cosa=11/[√(23²+11²)]=11/650