If tanA=1/2,tanB=1/3,show that A+B=45°and prove that A+B=1
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Step-by-step explanation:
tan(A−B)=
1+tanA.tanB
tanA−tanB
⇒ tan(A−B)=
1+
3
4
×
7
1
3
4
−
7
1
⇒ tan(A−B)=
1+
21
4
21
28−3
⇒ tan(A−B)=
21
25
21
25
⇒ tan(A−B)=1
⇒ A−B=tan
−1
(1)
⇒ A−B=
4
π
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