Question

The value of cotπ/20 cot3π/20 cot5π/20 cot7π/20 cot9π/20 is
A) -1
b) 1/2
c) 0
d) 1

Answer 1

i hope this helps :) http://www.wolframalpha.com/input/?i=cot%CF%80%2F20+cot3%CF%80%2F20+cot5%CF%80%2F20+cot7%CF%80%2F20+cot9%CF%80%2F20

Answer 2

huk meup with a medal if it did :)

Answer 3

no answer lik that in the options

Answer 4

use calculator. I think it may help