Ответы на вопрос:
1)tga*ctg-cos^2 a= 1-сos^2 a = sin^2 a2)sin^3 a+sina*cos^2 a\tga= sin^3 a+sina*cos^2 a\(sina\cosa) = sin^3 a+cos^3 a
3)sin^2 a+2cos^2 a-1= sin^2 a+2cos^2 a-sin^2 a-cos^2 a = cos^2 a4)3sin0+2cos0= 3*0+2*1 = 0+2 = 25)1+tg(3 pi\2+a)*sina*cosa= 1-ctga*sina*cosa = 1-cos^2 a = sin^2 a
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