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Lines whose equation are (x-3)/2=(y-2)/3...

Lines whose equation are `(x-3)/2=(y-2)/3=(z-1)/(lamda)` and `(x-2)/3=(y-3)/2=(z-2)/3` lie in same plane, then.
The value of `sin^(-1)sinlamda` is equal to

A

`3`

B

`pi-3`

C

`4`

D

`pi-4`

Text Solution

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The correct Answer is:
To solve the problem, we need to determine the value of \( \sin^{-1}(\sin \lambda) \) given that the lines represented by the equations lie in the same plane. ### Step-by-Step Solution: 1. **Identify the Direction Ratios and Points of the Lines:** The equations of the lines are given as: - Line 1: \( \frac{x-3}{2} = \frac{y-2}{3} = \frac{z-1}{\lambda} \) - Line 2: \( \frac{x-2}{3} = \frac{y-3}{2} = \frac{z-2}{3} \) From these equations, we can extract the direction ratios and points: - For Line 1: - Direction ratios: \( (2, 3, \lambda) \) - Point: \( (3, 2, 1) \) - For Line 2: - Direction ratios: \( (3, 2, 3) \) - Point: \( (2, 3, 2) \) 2. **Set Up the Determinant Condition:** For the two lines to lie in the same plane, the following determinant must equal zero: \[ \begin{vmatrix} 3 - 2 & 2 - 3 & 1 - 2 \\ 2 & 3 & \lambda \\ 3 & 2 & 3 \end{vmatrix} = 0 \] This simplifies to: \[ \begin{vmatrix} 1 & -1 & -1 \\ 2 & 3 & \lambda \\ 3 & 2 & 3 \end{vmatrix} = 0 \] 3. **Calculate the Determinant:** Expanding the determinant: \[ 1 \cdot \begin{vmatrix} 3 & \lambda \\ 2 & 3 \end{vmatrix} - (-1) \cdot \begin{vmatrix} 2 & \lambda \\ 3 & 3 \end{vmatrix} - 1 \cdot \begin{vmatrix} 2 & 3 \\ 3 & 2 \end{vmatrix} \] This gives: \[ 1(9 - 2\lambda) + (6 - 3\lambda) - (4 - 9) = 0 \] Simplifying: \[ 9 - 2\lambda + 6 - 3\lambda + 5 = 0 \] \[ 20 - 5\lambda = 0 \] 4. **Solve for \( \lambda \):** Rearranging gives: \[ 5\lambda = 20 \implies \lambda = 4 \] 5. **Find \( \sin^{-1}(\sin \lambda) \):** Now, we need to find \( \sin^{-1}(\sin 4) \). Since \( 4 \) radians is greater than \( \pi \) (approximately \( 3.14 \)), we can express \( 4 \) in terms of \( \pi \): \[ 4 = \pi + (4 - \pi) \quad \text{(where \( 4 - \pi \) is in the third quadrant)} \] In the third quadrant, \( \sin \) is negative, thus: \[ \sin(4) = -\sin(4 - \pi) \] Therefore: \[ \sin^{-1}(\sin 4) = \pi - 4 \] ### Final Answer: The value of \( \sin^{-1}(\sin \lambda) \) is \( \pi - 4 \).

To solve the problem, we need to determine the value of \( \sin^{-1}(\sin \lambda) \) given that the lines represented by the equations lie in the same plane. ### Step-by-Step Solution: 1. **Identify the Direction Ratios and Points of the Lines:** The equations of the lines are given as: - Line 1: \( \frac{x-3}{2} = \frac{y-2}{3} = \frac{z-1}{\lambda} \) - Line 2: \( \frac{x-2}{3} = \frac{y-3}{2} = \frac{z-2}{3} \) ...
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