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Let f:[-1,2]->[0,oo) be a continuous fu...

Let `f:[-1,2]->[0,oo)` be a continuous function such that `f(x)=f(1-x)fora l lx in [-1,2]dot` Let `R_1=int_(-1)^2xf(x)dx ,` and `R_2` be the area of the region bounded by `y=f(x),x=-1,x=2,` and the x-axis . Then (a)`R_1=2R_2` (b) `R_1=3R_2` (c)`2R_1` (d) `3R_1=R_2`

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