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Mathematics
Mathematics
Problem
If
sin
θ
=
5
13
\sin \theta = \dfrac{5}{13}
sin
θ
=
13
5
for an acute angle
θ
\theta
θ
, find
cos
θ
\cos \theta
cos
θ
. a)
8
13
\dfrac{8}{13}
13
8
b)
5
12
\dfrac{5}{12}
12
5
c)
12
13
\dfrac{12}{13}
13
12
d)
144
169
\dfrac{144}{169}
169
144
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