common.or
auth.dont_have_account auth.register
সরল কর :
(x+2y)3-3(x+2y)2 (x–2y)+3(x+2y) (x-2y)2–(x-2y)3
3x+y
x2+y
5p+2q
a2b+c2d
6p-7
ax-by
