[الشيمآء]

RoOoNa_91

1: y = csc ( sin x )
y'= - csc (sin x) cot(sin x) cos x

2: y= (3 + 1/x)^3
y'= -3/x^2(3 + 1/x)^2
y'' = 6/x^3(3 + 1/x)(3 + 2/x)

3: u = 1 - 9x/5
f(u) = u^-5
dy/dx = 9(1 - 9x/5)^-6