Precalculus Examples

$[\begin{array}{c} \cos (x) & - \sin (x) \\ \sin (x) & \cos (x) \end{array}] [\begin{array}{c} 2 \\ 6 \end{array}]$

Step 1

Multiply each row in the first matrix by each column in the second matrix.

$[\begin{array}{c} \cos (x) \cdot 2 - \sin (x) \cdot 6 \\ \sin (x) \cdot 2 + \cos (x) \cdot 6 \end{array}]$

Step 2

Simplify each element of the matrix by multiplying out all the expressions.

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Move $2$ to the left of $\sin (x)$ .

$[\begin{array}{c} 2 \cos (x) - 6 \sin (x) \\ 2 \cdot \sin (x) + \cos (x) \cdot 6 \end{array}]$

Move $6$ to the left of $\cos (x)$ .

$[\begin{array}{c} 2 \cos (x) - 6 \sin (x) \\ 2 \sin (x) + 6 \cos (x) \end{array}]$