Question

calcule o sen x sendo q o cos vale -4/5

Answer 1

sen²x + cos²x = 1 

sen²x + (-4/5)² = 1²

sen²x + 16/25 = 1 

sen²x = 1 - 16 / 25

sen²x = 9 / 25

senx = √9 / 25 

senx = 3 / 5