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Question-86723

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Question Number 86723 by A8;15: last updated on 30/Mar/20
Commented by jagoll last updated on 30/Mar/20
cos^2 x−sin^2 x = tan x × cot x cos 2x = 1 ⇒ { ((x = 0)),((x = π)) :}
cos2x−sin2x=tanx×cotxcos2x=1⇒{x=0x=π

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