Answer :

Given:

We can picture this using the right triangle below:



Now, Using the Pythagoras Theorem i.e. \




AC = 5k

Now, Using the formula,



Putting the values in the expression, we get,



Hence, 


OR

Given:

• tan 2A = cot (A – 18°)

• 2A is Acute

We know,

Putting θ = 2A

Now, 2A is acute.


(A – 18°) and (90° – 2A) are acute.


90° – 2A = A – 18°


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