Question

Определи сtgt, если t равно −2π3

Answer 1

ctg (-2π/3) = - ctg(2pi/3) = - (-1/√3) = 1/√3

Answer 2

$Ctg(- \frac{2 \pi }{3}) = - Ctg( \pi - \frac{ \pi }{3} ) = Ctg \frac{ \pi }{3} = \frac{ \sqrt{3} }{3}$