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Mathematics
Mathematics
Problem
Given
sin
x
=
3
5
\sin x=\dfrac{3}{5}
sin
x
=
5
3
and
π
2
<
x
<
π
\dfrac{\pi}{2}<x<\pi
2
π
<
x
<
π
, what is the sign of
cos
3
x
\cos 3x
cos
3
x
? a) Negative b) Cannot be determined c) Positive d) Zero
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