1)sqrt(1+sinx)= -cosx

2)sqrt(1-sinx)= - cosx

3) системы     sinx-cosy=1          cosx+siny=0,5

                     sinx+cosy=0          cosx-siny=0,5

4)cos^x - 2cosx+a=0

5) sin^x + 2sinx+a=0

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