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)°

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) (Show Source): You can put this solution on YOUR website!

Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.

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.

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