Question

знайти sin a, tg a, ctg a, якщо cos a = 1/5

Answer 1

sin a = √(1 - cos^2 a) = √(1 - (1/5)^2) = √(1 - 1/25) = √(24/25) = √24 / 5

tg a = sin a / cos a = (√24 / 5) / (1/5) = √24

ctg a = 1 / tg a = 1 / √24