Answer:
(√2+√6) / 4
Step-by-step explanation:
sin (7π/12) = sin (3π/12 + 4π/12) = sin 3π/12 cos 4π/12 + cos 3π/12 sin 4π/12
==> sin π/4 cos π/3 + cos π/4 sin π/3
==> (1/√2)(1/2) + (1/√2)(√3/2)
==> (√6+√2) / 4
