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.