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Let u-=a x+b y+a b3=0,v-=b x-a y+b a3=0,...

Let `u-=a x+b y+a b3=0,v-=b x-a y+b a3=0,a ,b in R ,` be two straight lines. The equations of the bisectors of the angle formed by `k_1u-k_2v=0` and `k_1u+k_2v=0` , for nonzero and real `k_1` and `k_2` are `u=0` (b) `k_2u+k_1v=0` `k_2u-k_1v=0` (d) `v=0`

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