Evaluate: `4/5+(3b-2a)/(3b+2a)`

Evaluate: (2a-3b)^(2)

Evaluate : (i) ((a)/(2b)+(2b)/(a))^(2)-((a)/(2b)-(2b)/(a))^(2)-4 (ii) (4a+3b)^(2)-(4a-3b)^(2)+48ab

Evaluate: (4a + 3b)^(2)- (4a-3b)^(2) + 48ab

Evaluate: (2a + 3b)^(3)

Evaluate : (iii) (4a - 3b) (2a + 5b)

Evaluate : (ix) (2a - 3b) (3a + 4b)

Evaluate : 5a^(3)b^(2) when a =3 and b = -2

Evaluate : (viii) (3a^(2) - 4b^(2) ) (8a^(2) - 3b^(2) )

Evaluate : 3b^(4) when b=2

Evaluate : (i) (cos 3A - 2 cos 4A)/(sin 3 A + 2 sin 4A) , when A = 15^(@) (ii) (3 sin 3B + 2 cos(2B + 5^(@)))/(2 cos 3B - sin(2B - 10^(@))) , when B = 20^(@)