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Trignometry

New kid on the Block

 Joined: 17 Apr 2012 Post: 18
2 May 2012 07:55:22 IST
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sin and cos
Engineering Entrance , JEE Main , JEE Advanced , Mathematics , Trigonometry

If sinA+sinB=1/3 and cosA+cosB=1/4. Then find sin(A+B) and cos(A+B).

Cool goIITian

Joined: 15 Oct 2011
Posts: 42
2 May 2012 09:54:35 IST
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sin(A+B)=24/25 and cos(A+B)=7/25).

New kid on the Block

Joined: 17 Apr 2012
Posts: 18
2 May 2012 10:11:38 IST
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sin and cos

New kid on the Block

Joined: 17 Apr 2012
Posts: 18
2 May 2012 10:14:21 IST
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Can you please tell the steps?

Blazing goIITian

Joined: 2 Mar 2012
Posts: 304
2 May 2012 11:07:16 IST
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### cos(A+B) = {1- tan((A+B)/2)^2}/{1+ tan((A+B)/2)^2}

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