Квадрат суммы

1) (a+b)^{2}
2) x^{2}+2xy+y^{2}
3) m^{2}+3mn+n^{2}
4) (2n+3)^{2}
5) a^{2}-4a+4
6) (x-y)^{2}
7) a^{2}+2ab+b^{2}
8) p^{2}+pq+q^{2}
9) (2n+3)^{2}
10) a^{2}+6a+q^{2}
11) (c+d)^{2}
12) 1+2x+x^{2}
13) a^{2}+8a+16
14) (2p+q)^{2}
15) 4a^{2}-4a+1