Answer:
y=50
Step-by-step explanation:
x = π/12, π/4, 3π/4, 11π/12, 17π/12, 19π/12
sin(4x) cos x − sin x cos(4x) = √2 / 2
Use angle difference formula.
sin(4x − x) = √2 / 2
sin(3x) = √2 / 2
3x = π/4 + 2kπ, 3π/4 + 2kπ
x = π/12 + 2kπ/3, π/4 + 2kπ/3
16.2
By geometric mean theorem:
6 : 4
3 : 2
6 : ?
3 × 2 : 2 ×2
