Answers

2015-02-04T20:56:27+05:30
2015-02-04T21:00:24+05:30
P²+pq-q²+pq
pq+pq-q²+p²
pq-q²+p²
I don't know this answer is correct or wrong if it is wrong I am sorry I f it is right then good
1 4 1