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Use double angle formulae and the product rule to prove that
d
d
x
sin
(
2
x
)
=
2
cos
(
2
x
)
sin
(
2
x
)
=
2
sin
(
x
)
cos
(
x
)
and
cos
(
2
x
)
=
cos
2
(
x
)
−
sin
2
(
x
)