16) f(x)=(9x+5)⁸
f(x)' =8(9x+5)⁷ * 9=72*(9x+5)⁷
17) f(x)=√(2x¹⁶+x³+6)
f(x)' = 1 * (32x¹⁵+3x²) = 32x¹⁵+3x²
2√(2x¹⁶+x³+6) 2√(2x¹⁶+x³+6)
18) f(x)= 1
sinx
f(x)' = - 1 * (sinx)' = - cosx
sin²x sin²x
19) f(x)=cos6x
f(x)'=-6sinx
21) f(x)=(x¹¹-2x+3)⁶+8x²
f(x)' =6(x¹¹-2x+3)⁵ * (11x¹⁰-2)+16x=(66x¹⁰-12)(x¹¹-2x+3)⁵+8x²