Factorise 4m3n2+12m2n2+18m4n3
Factorising m2 + 7m - 60 and dividing it by (m - 5) gives ___________ .
If (2n+1) θ=π, then 2n cos θ cos 2θ ⋯ cos 22 θ⋯ 2n−1θ=