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Trigonometric Identities
Question
If
x
=
a
cos
2
θ
sin
θ
and
y
=
a
sin
2
θ
cos
θ
, then
(
x
2
+
y
2
)
3
x
2
y
2
=
Moderate
A
a
B
a
3
C
a
2
D
a
5
Solution
θ
can be eliminated by substitution
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