(adsbygoogle = window.adsbygoogle || []).push({}); 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

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# Sine of sum and difference with 3 values

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