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`        If tan A = 1 - cos B/sin B show that tan 2A = tan B.`
2 years ago

Akash
50 Points
```							TanA =2sin2 (B/2)/2sin(B/2)cos(B/2) =tan(B/2)                now :-  tan2A =2tan(A)/1-tan2(A) =  2tan(B/2)/1-tan2(B/2)        = tan2 B/2 = tanB.  Hence it is proved.
```
2 years ago
Rakshita
13 Points
```							Change all into sin and cos functionSin A sin B = cos A – cos A cosCos (B-A) we easily get that B-A = AB = 2A, tan 2A = tan B
```
one year ago
Mehul Kochar
30 Points
```							TanA=1-CosB/SinBTan2A=2TanA/1-Tan2A=2(1-CosB)/SinB/1-(1-CosB)2/Sin2B=2(1-CosB)SinB/Sin2B-1-Cos2B+2CosB=2(1-CosB)SinB/2CosB-Cos2B-1=2SinB(1-CosB)/2CosB-(1+Cos2B)=2SinB(1-CosB)/2CosB-2Cos2B=2SinB(1-CosB)/2CosB(1-CosB)=TanB..........Hence Proved
```
7 months ago
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### Course Features

• 31 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions