Answer:
c .Perfect square trinomials
d.Difference of perfect squares
Explanation:
We have to find the special product formulas.
a.Perfect square monomials
It is of the form
![x^2](https://img.qammunity.org/2020/formulas/mathematics/middle-school/lj2p7ilwuzg3rb119glsof4tows22y4e2d.png)
It is not a special product formulas.
b.Difference of terms
It is of the form
![x-y](https://img.qammunity.org/2020/formulas/mathematics/high-school/6e0s3gwlzd5l7kgip4w8se0osqfq9iagqk.png)
It is not a special product formulas.
c.Perfect square trinomials
It is of the form
![(x+y)^2=x^2+y^2+2xy](https://img.qammunity.org/2020/formulas/mathematics/middle-school/gqb69l42m1yakvz05d9hlq2ljz55q0serb.png)
It is a special product formulas.
d.Difference of perfect squares
It is of the form
![x^2-y^2](https://img.qammunity.org/2020/formulas/mathematics/high-school/vna4kotpn2ypwryd8ma8a4i1lutexcx68b.png)
![(x+y)(x-y)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/6vi61arg6pnvpm1w12vk02ko2pswok0gkq.png)
Therefore, it is a special product formulas.