\fLet f(a) = - 8cos x + 5 tan x f' (2) = 2 8 sin (x ) + 5 sec (x 3 TT +\fdy sin (3x Find for y = dac 17 -203 dy = dacThe depth (in feet) of water at a dock changes with the rise and fall of tides. The depth is modeled by the function 71' 571' Dt =2' t () 3111(4 + 4)+3 where t is the number of hours after midnight. Find the rate at which the depth is changing at 6 am. Round your answer to 4 decimal places