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2cos²Θ-1 / sinΘcosΘ
= cos²Θ+cos²Θ-1 / sinΘcosΘ
= cos²Θ-sin²Θ/sinΘcosΘ
= cos²Θ/sinΘcosΘ - sin²Θ/sinΘcosΘ
= cosΘ/sinΘ - sinΘ/cosΘ
= cotΘ-tanΘ---------proved
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