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Trigonometry
medium
0:00.0
If
t
a
n
t
h
e
t
a
=
1
\\tan\\theta = 1
t
an
t
h
e
t
a
=
1
, find
c
o
s
(
2
t
h
e
t
a
)
\\cos(2\\theta)
cos
(
2
t
h
e
t
a
)
.
A
0.5
B
0
C
1
D
−
1
-1
−
1
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