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Prove that : (i)"tan"3A-"tan"2A-"tan"A...

Prove that :
(i)`"tan"3A-"tan"2A-"tan"A="tan"3A "tan"2A "tan"A`
(ii) `"tan"7A-"tan"5A-"tan"2A="tan"7A "tan"5A "tan"2A`
(iii) `"tan"13 A -"tan" 9A-"tan" 4A ="tan"13 A "tan"9A tan 4A. `

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