Find the derivative of:
7
sin
2
(
−
9
x
4
)
\displaystyle {7}{{\sin}^{{2}}{\left(-{9}{x}^{{4}}\right)}}
7
sin
2
(
−
9
x
4
)
.
Hint:
sin
2
(
x
)
=
[
sin
(
x
)
]
2
\displaystyle {{\sin}^{{2}}{\left({x}\right)}}={\left[{\sin{{\left({x}\right)}}}\right]}^{{2}}
sin
2
(
x
)
=
[
sin
(
x
)
]
2
...so use the
chain rule
(
twice!
).
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