Please show all steps and BOX the final answer.

f(x)-sin(\\/x2 +2x+9] #6.) Find the derivative of the function . f(x)= sin(cosx) #7.) Find the derivative of the function . 3' dy \"J Find dx by implicit differentiation. x + COS (3x y)' xy dy l _ 2 2 #9-) Find dx by implicit differentiation. x + y '14- x y #10.) Two small planes approach an airport, one ying clue west at 120 mi/hr and the other ying due north at 150 mi/hr. Assuming they y at the same constant elevation, how fast is the distance between the planes changing when the westbound plane is 180 miles from the airport and the northbound plane is 225 miles from the airport