If $m_{1}$ and $m_{2}$ are slopes of the lines represented by $\left(\sec ^{2} \theta-\sin ^{2}…

If $m_{1}$ and $m_{2}$ are slopes of the lines represented by $\left(\sec ^{2} \theta-\sin ^{2} \theta\right) x^{2}-2 \tan \theta x y+\sin ^{2} \theta y^{2}=0$, then $\left|m_{1}-m_{2}\right|=$
  1. 1
  2. 2
  3. 4
  4. 3

Solution

$\left(\operatorname{scc}^{2} \theta-\sin ^{2} \theta\right) x^{2}-2 \tan \theta x y+\sin ^{2} \theta y^{2}=0$ $\sqrt{a x^{2}+2 b x y+b y^{2}}=0$ $\left|m_{1}-m_{2}\right|=?$ $\left|m_{1}-m_{2}\right|=\sqrt{\left(m_{1}+m_{2}\right)^{2}-4 m_{1} m_{2}}$ $m_{1}+m_{2}=\frac{-2 h}{b}$ $m_{1} m_{2}=\frac{a}{b}$ $m_{1}-m_{2} \mid=\sqrt{\frac{4 \tan ^{2} \theta-4\left(\sec ^{2} \theta-\sin ^{2} \theta\right)}{\sin ^{2} \theta}}$ $=2$

Asked in: MHT CET 2020 (14 Oct Shift 1)

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