Mathematics
Mathematics, 20.06.2019 18:02, pandamaknae2003

Sina-sinb=2cos(a+b)/2 sin(a-b)/2 and cosa + cosb=2cos(a+b)/2cos(a-b)/2. prove it

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Sina-sinb=2cos(a+b)/2 sin(a-b)/2 and cosa + cosb=2cos(a+b)/2cos(a-b)/2. prove it...

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