A+B=45 then prove (1+tanA) (1+tanB)=2
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Answer:
Step-by-step explanation:
466
Answered by
0
Step-by-step explanation:
(1+tanA)(1+tanB)=x
1 + tanB + tanA + tanAtanB=x
(subtract both side by 2)
tanA + tanB -1+ tanAtanB=x-2
(divide both side by 1-tanAtanB)
{(tanA+tanB)/1-tanAtanB} - {(1-tanAranB)/(1-tanAtanB)}=
x-2/1-tanAtanB
tan(A+B) - 1 = x-2/1-tanAtanB
tan45 -1 = x-2/1-tanAtanB
0= x-2/1-tanAtanB [ tan45=1]
therefore,
x-2=0
x=2
since (1+tanA)(1+tanB)=x
therefore,
(1+tanA)(1+tanB)=2
hence proved
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