Vectors

Step 1: Use vector magnitude formula.
Step 2: Substitute values.
Since : Step 3: Correct evaluation.
Actually: But correct identity: **Wait, this is incorrect.** Re-evaluating carefully: But for angle , known identity: Let's re-check correctly: Thus the magnitude is: Final corrected computation shows the result is 1, but standard JEE pattern expects , giving .} Step 4: Final Answer.
Magnitude = 1.