Find the value of
To find: Value of 
We have,
Putting π = 180°
= cot (13 × 45°)
= cot (585°)
= cot [90° × 6 + 45°]
= cot 45°
[Clearly, 585° is in IIIrd Quadrant and the multiple of 90° is even]
= 1 [∵ cot 45° = 1]
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