Evaluate : `((4 + 8)/(2-(-6)))(4+8 -: 2 -(-6))`

Evaluate |(4+8)/(2-(-6))|-[4+8div 2-(-6)]

Evaluate: (8.6)^(2)-(1.4)^(2)

(-2)×(-4)×(-6)×(-8)

Find the sum of infinite terms of the series : (3)/(2.4) + (5)/(1.4.6) + (7)/(2.4.6.8)+ (9)/(2.4.6.8.10)+……

Find the sum of infinite terms of the series: (3)/(2*4)+(5)/(2*4*6)+(7)/(2*4*6*8)+(9)/(2*4*6*8*10)+

If ({:(11, -4), (8, -3):})({:(-x, 4), (-8, y):}) = -({:(2, 3),(6, 9):}) , then find 2x - y.

Find (dy)/(dx) when : y=x^(8)/8-x^(6)/6+x^(4)/4-2

Find the sum of infinite terms of the series : 3/(2*4)+5/(2*4*6)+7/(2*4*6*8)+9/(2*4*6*8*10)+...........