Question

Sendo Sen de x = 1/4 com 0 Calcule o Cos de x

Answer 1

senx = 1/4
cosx = ?

sen²x + cos²x = 1
(1/4)² + cos²x = 1
1/16 + cos²x = 1
cos²x = 1 - 1/16
cos²x = 15/16
cosx = √(15/16)
cosx = (√15) / 4