(sin(a) - cos(a) ) ² + (sin(a) + cos(a) ) ² - 2 =
= sin²(a) -2sin(a) cos(a) +cos²(a) + sin²(а)+ 2sin(a)cos(a)+ cos²(а) - 2=
= 1+1-2=0
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(sin(a) - cos(a) ) ² + (sin(a) + cos(a) ) ² - 2 =
= sin²(a) -2sin(a) cos(a) +cos²(a) + sin²(а)+ 2sin(a)cos(a)+ cos²(а) - 2=
= 1+1-2=0