If then write the value of

Prove that lies between and .

If α + β - γ = π, and sin² α + sin² β – sin² γ = λ sin α sin β cos γ, then write the value of λ.

Write the maximum and minimum values of 3 cos x + 4 sin x + 5.

Write the maximum values of 12 sin x – 9 sin² x.