Continuity and DifferentiabilityHard
Question
If y = tan x tan 2x tan 3x then 
is equal to -
is equal to -Options
A.3 sec2 3x tan x tan 2x + sec2x tan 2x tan 3x + 2 sec2 2x tan 3x tan x
B.2y (cosec 2x + 2 cosec 4x + 3 cosec 6x)
C.3 sec2 3x - 2 sec2 2x - sec2 x
D.sec2x + 2 sec2 2x + 3 sec2 3x
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