Ответ:
ctg(3π/2+a)tg(π/2-a)-cos(π-a)sin(π/2-a)= -tga*ctga-(-cosa)*cosa= -1+cos²a= -1(1-cos²a)= -sin²a.
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Ответ:
ctg(3π/2+a)tg(π/2-a)-cos(π-a)sin(π/2-a)= -tga*ctga-(-cosa)*cosa= -1+cos²a= -1(1-cos²a)= -sin²a.