If `2/(2+2/(2+2/x))=3` , then `x` is equal to `-4/7` (b) `4/7` (c) `-4/9` (d) `4/9`

If (x,3)+(2,5)=(7,8) then x is equal to a)2 b)5 c)7 d)9

If y=x/(x+1)+(x+1)/(x) , then (d^(2)y)/(dx^(2)) at x = 1 is equal to a) 7/(4) b) 7/(8) c) 1/(4) d) (-7)/(8)

|{:( x -2, 2x -3, 3x -4), ( x-4, 2x - 9, 3x - 16), ( x-8, 2x - 27, 3x - 64):}|= 0, then x is equal to: a)-2 b)3 c)-4 d)4

lim_(x->0) (1-cos x cos 2x cos 3x)/ (sin^2 2x) is equal to a) 3/4 b) 7/4 c) 7/2 d) -3/4

lim_(x->0) (1-cos x cos 2x cos 3x)/ (sin^2 2x) is equal to a) 3/4 b) 7/4 c) 7/2 d) -3/4

If x/6+x/4=x/2+3/4, then x= (a) 9 (b) 6 (c) -9 (d) 4

If 3x+(2)/(x)=7, then (9x^(2)-(4)/(x^(2)))=25 (b) 35(c)49(d)30

If 3x+2/x=7, then (9x^2-4/(x^2))=? (a)25 (b) 35 (c) 49 (d) 30

If x : y=2:3 and y : z=2:3 , then x : z= (a) 2:3 (b) 3:4 (c) 5:7 (d) 4:9

If 4:3=x^(2):12, then the value of x(x>0)16( b) 4(c)9(d)3