Let $0 < a < b < \frac{π}{2} \dot{I} f f (x) = ∣ tan x tan a tan b sin x sin a sin b cos x cos a cos b ∣, t h e n$ find the minimum possible number of roots of $f^{p r i m e} (x) = 0$ in $(a, b) ˙$

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Let

0 < a < b < \frac{π}{2} \dot{I} f f (x) = ∣ tan x tan a tan b sin x sin a sin b cos x cos a cos b ∣, t h e n

find the minimum possible number of roots of

f^{p r i m e} (x) = 0

(a, b) ˙

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Question Text

Let

0 < a < b < \frac{π}{2} \dot{I} f f (x) = ∣ tan x tan a tan b sin x sin a sin b cos x cos a cos b ∣, t h e n

find the minimum possible number of roots of

f^{p r i m e} (x) = 0

(a, b) ˙

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