Ответ:
Объяснение:
2. sin(pi-a)/2sin(pi/2-a) = sin(a)/2cos(a) = tan(a)/2
3. (1-sina)(1+sina) = 1^2 - sin^2(a) = 1 - sin^2(a) = cos^2(a)
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Ответ:
Объяснение:
2. sin(pi-a)/2sin(pi/2-a) = sin(a)/2cos(a) = tan(a)/2
3. (1-sina)(1+sina) = 1^2 - sin^2(a) = 1 - sin^2(a) = cos^2(a)