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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)`

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The correct Answer is:
A
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