Just use the formula tan θ = |(m₁ – m₂)/(1 + m₁m₂)|, but remember, if the lines are perpendicular, 1 + m₁m₂ becomes zero. I know this because I solve these problems every evening after the stall closes, my notebook stained with chutney. But sometimes I think, the real angles in life, like between my daughter's dreams and my tired hands, no formula can measure that, na?
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