27- Let f-x- - sinx - cosx- g-x- - x2-1- then g -f-x- is invertible for x e-2-1-202-4-T T-3-4tlo

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27. Let f(x) ...

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27. Let f(x) = sinx + cosx, g(x) = x2-1, then g (f(x)) is invertible for x e(2)\lbrack 즐이(1)202(4)T T(3)4tlo

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f (x) = s i n x + c o s x, g (x) = x^{2} - 1

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