n ∈ Z +, đặt fn(x) = sin x sin 2x · · ·sin(2^nx). prove that: |fn(x)| ≤ 2/ √ 3 |fn( π /3 )|, ∀x, n. please help me!!!

Answer this question, only if you know the answer. 30 points and brainliest!

Afruit stand has to decide what to charge for their produce. they need $10 for 4 apples and 4 oranges. they also need $15 for 6 apples and 6 oranges. we put this information into a system of linear equations. can we find a unique price for an apple and an orange?

Look at attachment. has all info needed. need