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Q.

If AD1BE1CF1=ππ23B−CE−F0CF1thenStatement 1: tanA+tanB+tanC=tanA.tanB.tanCStatement 2: cotD+cotE+cotF=cotD.cotE.cotFThen

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a

only one is true

b

only 2 is true

c

both 1 and 2 are true

d

None of them is true

answer is C.

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Detailed Solution

If A+B+C=π⇒tanA+tanB+tanC=tanAtanB·tanC If D+E+F=π2 then cotD+cotE+cotF=cotD·cotE·cotFNow,          AD1BE1CF1     apply R1→R1+R2+R3, R2→R2-R3      = A+B+CD+E+F3B-CE-F0CF1      = ππ23B-CE-F0CF1    given  ⇒A+B+C=π and D+E+F=π2 ∴Statement (1) and statement (2) both are true.
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