Answer
The major product is trans-1,2-cyclodecanediol.
Work Step by Step
1) Epoxide ring is formed using MCPBA.
2) The ring is protonated using an acid.
3) Water comes and attacks the most substituted carbon and opens the ring.
4) Then the water molecule is deprotonoted to give a diol.
This reaction yields a trans product, because the hydrogens are on different sides.