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Some Applications Of Trigonometry

Question

In ΔABC, ∠B = 90°
3 sin A = 3/5 , what is the value cos C.

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Solution

We have, ∠B = 90°
and

sinA space equals space 3 over 5 space equals space BC over AC

Now,

cosC space equals space BC over AC equals 3 over 5