sinx+cosx+cosecx+secx+tanx+cotx=7 and sin2x = a-b(sqrt7), then

A) a=8 B) a=22

C)b=8 D)b=2

This expression equals to(Sin^2 x+1)/(sin x) +(cos^2 x+1)/(cos x)+tan^2 x+1)/tan x=((sin x+cos x)(sinx cosx+1)÷(sin x cos x))+ 2/sin 2x= (1+sin 2x)(1+(sin 2x)/2)÷2/sin 2xOn substituting sin 2x=a-broot 7; and substitute the values of a and b, we get the correct answer