1. 

   math_celebrity Administrator Staff Member

   calculate cos(x) given tan(x)=8/15
   
   tan(x) = sin(x)/cos(x)
   sin(x)/cos(x) = 8/15
   
   Cross multiply:
   15sin(x) = 8cos(x)
   
   Divide each side by 8
   cos(x) = 15sin(x)/8

    

   math_celebrity, Mar 21, 2018

   #1
   
   

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