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Given the matrix \( T \) in the problem, we are asked to find the values of \( t_{42} \) and \( t_{12} \). Here, \( t_{ij} \) represents the element in the \( i \)-th row and \( j \)-th column of the matrix.

The matrix \( T \) is given as:

\[
T = \begin{pmatrix} 
1 & -2 & 3 & 0 \\ 
-3 & 2 & 0 & -1 \\ 
2 & 0 & 1 & 1 \\ 
0 & 3 & -1 & 0 
\end{pmatrix}.
\]

1. **Finding \( t_{42} \):**
   - The element in the 4th row and 2nd column is \( t_{42} = 3 \).

2. **Finding \( t_{12} \):**
   - The element in the 1st row and 2nd column is \( t_{12} = -2 \).

So, the values of \( t_{42} \) and \( t_{12} \) are \( 3 \) and \( -2 \), respectively.

### Answer
The correct answer is **A. 3 dan -2**.

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### Related Questions
1. What is the value of \( t_{34} \) in the given matrix?
2. Can you identify the diagonal elements of matrix \( T \)?
3. How do you find the transpose of matrix \( T \)?
4. What is the sum of all elements in the matrix \( T \)?
5. If matrix \( T \) is multiplied by a scalar, say 2, what will the new \( t_{12} \) be?

### Tip
Always identify the correct row and column in a matrix to avoid mistakes when finding specific elements. Remember, \( t_{ij} \) refers to the element in the \( i \)-th row and \( j \)-th column.

Diketahui matriks T = \begin{pmatrix} 1 & -2 & 3 & 0 \\ -3 & 2 & 0 & -1 \\ 2 & 0 & 1 & 1 \\ 0 & 3 & -1 & 0 \end{pmatrix}, nilai dari t_{42} dan t_{12} adalah ...

Given a 4x4 matrix T, this problem asks to find the specific values of the elements in the 4th row, 2nd column (t_{42}) and 1st row, 2nd column (t_{12}). This exercise focuses on matrix element identification, suitable for students in Grades 10-12.

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