Partial Fractions

[royal otter]

How would I do part d?

[quick thistle]

u don't

[molten hedge]

$$\frac{4w}{1 - w^4} = \frac{4w}{(1 + w)(1 - w)(1 + w^2)}$$

[summer raptor]

AmbivalentChamp

[molten hedge]

Hence

$$\frac{4w}{(1 + w)(1 - w)(1 + w^2)} \equiv \frac{A}{(1 + w)} + \frac{B}{(1 - w)} + \frac{Cx + D}{(1 + w^2)}$$

[summer raptor]

AmbivalentChamp

[molten hedge]

1 + w² isn't real so the fraction has to have a linear numerator

[royal otter]

I see

Thank you so much for your help

[dusk root]

Skull

Can we /solved this please