1.

If f(x) = |{:(sinx,sina, sin b),(cos x , cos a, cos b),(tanx,tana,tanb):}|,where 0 lt a lt b lt ( pi )/(2), then the equation f'(x) = 0 has, in the interval (a,b)

Answer»

ATLEAST ONE ROOT
ATMOST one root
no root
exactly one root

Answer :A


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