`81p^(2)-198pq`

If p cos c theta+q cot theta=2 and p^(2)cos ec^(2)theta-q^(2)cot^(2)theta=5 then the value of sqrt(81p^(-2)-q^(-2)) is

Factorize 81p^(7)-p^(3)q^(4)

(p-q)^(2)+4pq

Factorise the following expression : 81x^2 - 198xy + 121y^2 .

Add : 6p^(2)q - 5pq^(2) -3pq, 8pq^(2)+2p^(2)q -2pq

Add : 6p^(2)q - 5pq^(2) -3pq, 8pq^(2)+2p^(2)q -2pq

Find the excess of 4p^(2)-2pq +3q^(2) over 2p^(2)-pq +4q^(2) .