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If sec 4A = csc (A - 20), where 4A is acute, then find A.

 Dec 26, 2019
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sec (4A)  =  csc (A - 20)

 

These  are cofunctions which means that    

 

(4A ) +  (A - 20) = 90

 

5A  =  110

 

A = 22°

 

 

cool cool cool

 Dec 26, 2019

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