Answer:
Let sin?1x
= 
L.H.S. =
3 sin?1 x = 
,,,
(1)
= R.H.S. =
sin?1 (3x ? 4x3)
= sin?1
(
)
= 
?
(2)
from
(1) and (2), 3 sin?1x(4x3 ? 3x).
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