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NCERT Class XI Mathematics - Trigonometric Functions - Solutions

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Question : 17 of 61
Marks: +1, -0
cot (−
15π
4
)
Solution:  
cot (−
15π
4
) = - cot (
15π
4
) = - cot (4π−
π
4
) = cot
π
4
 = 1
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