9. f'(x) = ((7x+4)⁵) ' =5(7x+4)⁴*(7x+4) ' =5(7x+4)⁴*7=35(7x+4)⁴.
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10. y ' =(3e^3x+2sinx) ' =3e^3x*(3x)' +2cosx =9e^3x +2cosx .
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11. y ' = (x*tq3x +2^x)'=(x)'*tq3x + x*(tq3x)' +(2^x) '=
tq3x +x*1/cos²x *(3x) '+(2^x)*Ln2=tq3x +3x/cos²x+(2^x)*Ln2.
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12.f'(x) =(x*sin2x) ' =(x)' *sin2x + x*(sin2x)' =1*sin2x + x*cos2x*(2x)' =sin2x + 2xcos2x.
f'(xo) =f'(π/2) =sin2*π/2 + 2*π/2*cos2*π/2=sinπ +π*cosπ =0+π*(-1) = -π.