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Let 0ltaltbltpi/2. \ If \ f(x)=|[tanx,ta...

Let `0ltaltbltpi/2. \ If \ f(x)=|[tanx,tana,tanb],[sinx,sina,sinb],[cosx,cosa,cosb]|`, then find the minimum possible number of roots of `f^(prime)(x)=0` in (a , b)

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one root
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