sec thata(1-sintheta)(sec theta+tan theta)=1
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secФ(1-sinФ)(secФ+tanФ) [Ф is theta]
as secФ=1/cosФ;tanФ=sinФ/cosФ
⇒1/cosФ(1-sinФ)(1/cosФ+sinФ/cosФ)
⇒1/cos²Ф(1-sinФ)(1+sinФ)
⇒1/cos²Ф(1-sin²Ф)
⇒1/cos²Ф*(cos²Ф)⇒1
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