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Sine of sum and difference with 3 values 
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#1
Mar912, 03:20 PM

P: 31

1. The problem statement, all variables and given/known data
_{sin (90  θ + λ) = sin90cos(θ + λ)  cos90sin(θ + λ) = cos(θ + λ) The book says cos(θ  λ) So are we both right and if so how can I manipulate mine to look like the books answer.} 2. Relevant equations 3. The attempt at a solution 


#2
Mar912, 04:08 PM

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Thanks
P: 26,157

hi afrocod!
= sin90cos(θ  λ)  cos90sin(θ  λ) 


#3
Mar912, 04:28 PM

P: 31

Ah my old friend Tim.
I was surprised that 100's of people looked at this and nobody answered. I suspected this was a super easy question, as you just proved. Thank you very much. 


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