CAGNVIOS.LEVEL-11. Find the domain of de...

CAGNVIOS.LEVEL-11. Find the domain of definition of f(x) = cos (x2 - 4).2. Find the domain of f(x) = 2 cos2x + sin-?x.3. Find the domain of f(x) = cos2x+cos X.4. Find the principal value of each of the following:(i) cos-11-13 [NCERT)[NCERT)

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