Given SiNx cosx = 1 / 2, the value of sinxcosx is____ (process!)

Given SiNx cosx = 1 / 2, the value of sinxcosx is____ (process!)

sinx-cosx=1/2
Square on both sides
(sinx)^2-2sinxcosx+(cosx)^2=1/4
1-2sinxcosx=1/4
2sinxcosx=3/4
sinxcosx=3/8