Докажите формулы sina+sinb=2sin(a+b)/2cos(a-b)/2
sina-sinb=2sin(a-b)/2cos(a+b)/2
cosa+cosb=2cos(a+b)/2cos(a-b)/2
cosa-cosb=2sin(a+b)/2sin(b-a)/2
tga+tgb=sin(a+b)/cosacosb
tga-tgb=sin(a-b)/cosacosb
ctga+ctgb=sin(a+b)/sinasinb
ctga-ctgb=sin(b-a)/sinasinb
sina-sinb=2sin(a-b)/2cos(a+b)/2
cosa+cosb=2cos(a+b)/2cos(a-b)/2
cosa-cosb=2sin(a+b)/2sin(b-a)/2
tga+tgb=sin(a+b)/cosacosb
tga-tgb=sin(a-b)/cosacosb
ctga+ctgb=sin(a+b)/sinasinb
ctga-ctgb=sin(b-a)/sinasinb
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