x = 4 sin (2y + 6)
Sin (2y +6) = x/4
where x = opp.
4 = hyp.
To find adjacent uuse Pythagoras theorem
adj = sqrt 16 - x^2
Cos ( 2y +6) = adj / hyp
= (sqrt. 16 - x^2)/4
dy/dx = 1/8cos(2y+6)
Simplify
1/8 . 1/cos(2y+6)
1/8 . 1/ sqrt. 16 - x^2 / 4
= 1/2 sqrt 16 - x^2
eh If yuh couldnt understand wat I did let me know
check da attached paper