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In $\triangle{ABC}$, $\cos{B}=\frac{3}{5}$ and angle A is 90 degrees. What is $\cos{C}$?

 Apr 19, 2021
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cos c = 4/5         

 

cos c = sin b

    

find sin b      cos^2 + sin^2 = 1

                       9/25 + sin^2 =1

                                  sin^2 = 16/25

                                     sin b = 4/5                   cos c = sin b = 4/5

 Apr 19, 2021

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