Find the angle between straight line 2x+3y+3=0 and 3x-2y+4=0
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By data 2x + 3y – 4 = 0 … (1)
3x – 2y + 5 = 0 …… (2)
∴ Slope of (1) = -a/b = -2/3 = m1
∴ the angle between the lines is 90°
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