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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