[tex](sin \alpha+cos \alpha)^{2} + (sin \alpha - cos \alpha)^{2}-2[/tex] упростить
sin^2a+2sina*cosa+cos^2a+sin^2a-2sina*cosa+cos^2a-2=1+1-2=0
+2sina*cosa-2sina*cosa =0
sin^2a+cos^2=1
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sin^2a+2sina*cosa+cos^2a+sin^2a-2sina*cosa+cos^2a-2=1+1-2=0
+2sina*cosa-2sina*cosa =0
sin^2a+cos^2=1