y=f(x₀)+f'(x₀)(x-x₀)
y=2-x-x³, x₀=0
y(x₀)=2
y'=-1-3x²
y'(x₀)=-1
y=2-1(x-0)
y=2-x
y=2-x-x³, x₀=3
y(x₀)=2-3-27=-28
y'=-1-3x²
y'(x₀)=-1-3*9=-28
y=-28-28(x-3)
y=-28-28x+84
y=-28x+56
y=3sinx, x₀=π
y(x₀)=3sinπ=0
y'=3cosx
y'(x₀)=3cosπ=-3
y=0-3(x-π)
y=-3x+3π