Question

直线的倾斜角为a,若sina=3/5,求直线的斜率

Answer 1

即2:(1-x)=4:5

4(1-x)=2×5=10

1-x=10÷4=2.5

x=1-2.5

x=-1.5

5²-x²=12²-(13-x)²

25-x²=144-169+26x-x²

26x=50

x=25/13