Question: 21. 12 Where does f(x) = 2 secx - tan x have horizontal tangent lines? 9 = sinx - cost 9 = cost + sink

21. 12 Where does f(x) = 2 secx - tan x

21. 12 Where does f(x) = 2 secx - tan x have horizontal tangent lines? 9 = sinx - cost 9 = cost + sink 25 . In the interval [0, x], what values of x does f (x) = = sin' x - cos x have horizontal tangent lines

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