? asked in 科學及數學數學 · 1 decade ago

Rectangle Coordinates System

The slope of line L is 3.

If each of the lines L1 and L2 makes an angle C with L, where tanC = k.

a) Express the slopes m1, m2 of the lines L1 and L2 in terms of k

b) If L1 ( _I_ ) L2 , find the value of k

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