What is the value of cot((15pi)/2) ?

The value of cot((15pi)/2) is 0

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cot((15pi)/2)

cot (\frac{15 π}{2})

0

Solution steps

cot (\frac{15 π}{2})

cot (\frac{15 π}{2}) = cot (\frac{π}{2})

cot (\frac{15 π}{2})

Rewrite

\frac{15 π}{2}

π \cdot 7 + \frac{π}{2}

= cot (π 7 + \frac{π}{2})

Apply the periodicity of

cot

cot (x + π \cdot k) = cot (x)

cot (π \cdot 7 + \frac{π}{2}) = cot (\frac{π}{2})

= cot (\frac{π}{2})

= cot (\frac{π}{2})

Use the following trivial identity:

cot (\frac{π}{2}) = 0

cot (\frac{π}{2})

cot (x)

periodicity table with

πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cot (x) \mp \infty 31 \frac{3}{3} 0 - \frac{3}{3} - 1 - 3

= 0

= 0

- cos (π) - cos (0)

\frac{8}{tan ( 3 4 ^{\circ} )}

cos (\frac{5 π}{7}) cos (\frac{3 π}{5}) - sin (\frac{5 π}{7}) sin (\frac{3 π}{5})

cos (\frac{6 π}{6})

sin^{2} (7 0^{\circ}) + cos^{2} (7 0^{\circ})