Ответы и объяснения

2013-02-05T14:28:23+00:00

1) = cosx*(cosx-1)+sinx*(-sinx)= cos^2 x-cosx- sin^2 x= cos2x-cosx

2) = 2x*ctgx - x^2/sin^2 x

3) = -sinx*(1+sinx) + cosx*cosx= -sinx - sin^2 x + cos^2 x= cos2x - sinx

4) = 2x*tgx+ x^2/cos^2 x