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Mathematics
Mathematics
Problem
Evaluate
sin
(
−
7
π
6
)
cos
(
25
π
4
)
+
cos
(
−
13
π
3
)
\sin\left(-\dfrac{7\pi}{6}\right)\cos\left(\dfrac{25\pi}{4}\right)+\cos\left(-\dfrac{13\pi}{3}\right)
sin
(
−
6
7
π
)
cos
(
4
25
π
)
+
cos
(
−
3
13
π
)
, giving your answer in simplest exact form.
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