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Dear Piyush,
Cos(A+B)=4/5= 0.8A+B =36.87 Sin(A-B)=5/13 = 0.3846A-B = 22.62by adding2A =36.87 + 22.62 = 59.49tan 2A = tan 59.49= 1.6969
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Dear friend,
sin(a+b)=3/5 cos(a-b)=12/13
sin,cos are possitive .so,they lies in Q1
(by pythagarus rule adj side is 4)
3 5
4 (since sin(a+B)=3/4)
=a+b
therefore tan(a+b)=3/4
cos(a-b)=12/13
5 13 (by pythagarus rule opp'' side is 5)
12 (since cos(a-b)=12/13)
=a-b
(therefore tan(a-b)=5/12)
tan(a+b+a-b)=tan2a
=tan(a+b)+tan(a-b)
1-tan(a+b).tan(a-b)
= 3/4 +5/12
1-3/4 *5/12
(by solving this you get tan2a=56/33)
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