SOLUTION: Given that x is an acute angle and cos x=(2√5)/7 , find without using mathematical tables or a calculator , the value of tan(90-x)°

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Question 1195244: Given that x is an acute angle and cos x=(2√5)/7 , find without using mathematical tables or a calculator , the value of tan(90-x)°
Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) About Me  (Show Source):
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
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Notice that without using tables or a calculator,  we can find an exact  EXPRESSION  for  cos(90°-x),  ONLY,
but not its value itself.


I am telling it to explain you that the formulation of the problem is incorrect and should be changed.