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In alpha ge 0 ,betage0 and alpha+betalep...

In `alpha ge 0 ,betage0 and alpha+betalepi`, then
i) `cos(alpha+beta) = cos alpha cosbeta-sinalpha sinbeta`

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In alpha ge 0 ,betage0 and alpha+betalepi , then ii) cos(alpha-beta) = cos alpha cosbeta+sinalpha sinbeta

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Knowledge Check

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