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NCERT Class XI Mathematics - Trigonometric Functions - Solutions

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Question : 17 of 61
Marks: +1, -0
cot (−15π4)\left(-\frac{15\pi}{4}\right)
Solution:  
cot (−15π4)\left(-\frac{15\pi}{4}\right) = - cot (15π4)\left(\frac{15\pi}{4}\right) = - cot (4π−π4)\left(4\pi - \frac{\pi}{4}\right) = cot π4\frac{\pi}{4} = 1
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