công thức lượng giác 11

sinx = 0

• x = kπ

• x = k2π

• x= π/2 + kπ

• x = π/2 + k2π

sinx = 1

• X = kπ

• X = K2π

• x = π/2 + k2π

• x = π/2 + kπ

Cosx = 0

• x = π/2 + kπ

• x = π + k2π

• X = π/2 + k2π

• x = kπ

cosx = 0

• X = k2π

• X = kπ

• X = π/2 + kπ

• X = π/2 + k2π

Cosx = -1

• X = π + k2π

• X = kπ

• x = k2π

• x = -k2π

1 + tan²x =?

• 1/cos²x

• 1/sin²x

• sin²x/cot²x

• 1/cot²x

1/sin²x - 1

• cot²x

• tan²x

• Cos²x

• 1/cot²x

Cos(-x) =

sin(-x)

tan(-x) =