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Which of the following is/are correct? (...

Which of the following is/are correct? (A) `cos(cos pi) = cos(cos 0)` (B) `cos x + 1/(cos x)=3/2` for some value of x (C)`sqrt(1+102sqrt(1+99.101))=101` (D) `sin(1)- cos(1) lt 0`

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