4) Prove tan 20 tan40 tan 60
tan 80=3
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ᴡᴏᴏ ᴀ ᴡᴏᴏ ᴡᴏᴏ ᴩ ᴡᴏᴏ ᴩ ᴡᴏᴏ ᴡᴏᴏ ᴩ ᴡᴏᴏ ᴡᴏᴏ
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The answer is on Textbook of class 11th Math's (MH board) page no. 44
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