Question

check my answer please:

Answer 1

\[y=\coth(2x^4-9)\]
anwer:
\[-8x^3*csch(9-2x^4)^2\]

Answer 2

Looks good, but make sure the square is on the whole trig term not just the angle:
\[\huge{-8x^3*csch^2(2x^4-9)}\]
or
\[\huge{-8x^3*(csch(2x^4-9))^2}\]