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Problem
Problem
The value of
lim
x
→
4
(
cos
α
)
x
−
(
sin
α
)
x
−
cos
2
α
x
−
4
\lim_{x \to 4} \frac{(\cos \alpha)^x - (\sin \alpha)^x - \cos 2\alpha}{x-4}
lim
x
→
4
x
−
4
(
c
o
s
α
)
x
−
(
s
i
n
α
)
x
−
c
o
s
2
α
,
α
∈
[
0
,
π
2
]
\alpha \in \left[ 0, \frac{\pi}{2} \right]
α
∈
[
0
,
2
π
]
is
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