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Natalija [7]
3 years ago
5

In this figure, sin(a) = 23

Mathematics
1 answer:
WITCHER [35]3 years ago
4 0
a and b are complementary, or b=\dfrac\pi2-a. So

\cos b=\cos\left(\dfrac\pi2-a\right)=\sin a

and so \cos b=\dfrac23.
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