Question

Why the tan2A is changed into cot(90-2A)

Answer 1

Answer:

Step-by-step explanation:

We know that  Cot(90 - θ) = 1/Tan(90 - θ)

But as per trigonometric identity, Tan(90 - θ) = Cotθ

Cot(90 - θ) = 1/Cotθ

Cot(90 - θ) = Tanθ

hence Tan 2A = Cot (90 - 2A)

Hope this answers your question.