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