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Problem
Problem
The set of values of
λ
∈
R
\lambda \in \mathbb{R}
λ
∈
R
such that
tan
2
θ
+
sec
θ
=
λ
\tan^2 \theta + \sec \theta = \lambda
tan
2
θ
+
sec
θ
=
λ
holds for some
θ
\theta
θ
is a.
(
−
∞
,
1
]
(-\infty, 1]
(
−
∞
,
1
]
b.
(
−
∞
,
−
1
]
(-\infty, -1]
(
−
∞
,
−
1
]
c.
ϕ
\phi
ϕ
d.
[
1
,
∞
)
[1, \infty)
[
1
,
∞
)
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