For all permissible values of `x`, if `y= (sin3x(cos6x+cos4x))/(sinx(cos8x+cos2x))`, then range of `y` is `(-oo,a)uu(b,oo)` If `2b` is the first term of a G.P and `a` is its common ratio then
A. `b - a = 10/3`
B. `3a+b=4`
C. `S_(oo) = 9`
D. `S_(oo) = 27/10(a+b)`
