SOLUTION: suppose A lies between 0 and 90 and {{{sec A + tan A = 4}}} determine cos(A)

Question 1151777: suppose A lies between 0 and 90 and determine cos(A)
Answer by Edwin McCravy(20065) (Show Source): You can put this solution on YOUR website!
























cos(A)=0;  8-17cos(A)=0
   A=90°;   -17cos(A)=-8
               
               

We discard 90° because neither sec(90°) nor tan(90°) 
which occur in the original equation are defined.

Answer: 

Edwin

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