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8. misal u = 1 / x+1 --> misal v = 1 , v' = 0
w = x+1, w' = 1
u' = 1.1 - 0 (x+1) / (x+1)²
= 1 / (x+1)²
y = sin u
y' = u' cos u
= 1/ (x+1)² cos (1 / x+1)
9. y = sin (x²+1)
dy/dx = cos (x²+1) (2x)
= 2x cos (x²+1)