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EXPLANATION.
As we know that,
Fundamental trigonometric identities.
⇒ sin²θ + cosθ = 1.
⇒ 1 + tan²θ = sec²θ.
⇒ 1 + cot²θ = cosec²θ.
⇒ secθ = 1/cosθ.
⇒ tanθ = sinθ/cosθ
Using this identities in this question, we get.
First we solve LH.S.
Now, we solve R.H.S.
Hence proved.
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