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Mathematics
Mathematics
Problem
In Exercises 11-51, prove the identity. 49.
cos
3
x
=
(
1
−
sin
2
x
)
(
cos
x
)
\cos ^{3} x=\left(1-\sin ^{2} x\right)(\cos x)
cos
3
x
=
(
1
−
sin
2
x
)
(
cos
x
)
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