We can picture this using the right triangle below:
Now, Using the Pythagoras Theorem i.e. \
AC = 5kNow, Using the formula,
Putting the values in the expression, we get,
• tan 2A = cot (A – 18°)
• 2A is Acute
Putting θ = 2A
Now, 2A is acute.
(A – 18°) and (90° – 2A) are acute.
⇒ 90° – 2A = A – 18°
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