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("lim")(xvecoo)(sin^4x-sin^2x+1)/(cos^4x...

`("lim")_(xvecoo)(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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