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Cross Product Condition for Parallel Directions
## Formula
For direction vectors:
$$\vec d_1=(a_1,b_1),\quad\vec d_2=(a_2,b_2)$$
parallelism requires:
$$a_1b_2-a_2b_1=0$$
## Usage
- Used to test whether two direction vectors are parallel.
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Cross Product Condition for Parallel Directions
## Formula
For direction vectors:
$$\vec d_1=(a_1,b_1),\quad\vec d_2=(a_2,b_2)$$
parallelism requires:
$$a_1b_2-a_2b_1=0$$
## Usage
- Used to test whether two direction vectors are parallel.
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