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lim(x->oo)(sin^4x-sin^2x+1)/(cos^4x-cos^...

`lim_(x->oo)(sin^4x-sin^2x+1)/(cos^4x-cos^2x+1)` is equal to

(a) 0

(b) 1

(c) `1/3`

(d) `1/2`

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