Question

resolva os seguintes problemas matemáticos ​

Answer 1

• 2senx - 1 > 0

senx > 1/2

S = {x e R | 30° < x < 120°}

• cosx < 3½/2

S = {x e R | 30° < x < 330°}

• 2sen²x - 3senx + 1 = 0

Delta = 1

p = 1

q = 1/2

sen²p - cos²q = sen²1 - cos²(1/2)

• 2cosx - cosx > 0

Delta = 1

x1 = 1/2

x2 = 0

S = { x e R | x < 0 e x > 1/2}