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The mid- point of the domain of the function f (x) =sqrt( 4 − 2x + 5) for real x is

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The value of sec9° – sec27° – sec63° + sec81° is Let n be a natural number and let 'a' be a real number. The number of zeros of x^2n+1 – (2n + 1) x + a = 0 in the
interval [–1, 1] is –