x=1
Объяснение:
=8x-sin(90-70)cos70+cos(90+70)sin70= 7
8x-cos70cos70-sin70sin70= 7
8x-(cos^2(70)+ sin^2(70))=7
8x-1=7 ; 8x=8 ; x=1
x=1
Объяснение:
=8x-sin(90-70)cos70+cos(90+70)sin70= 7
8x-cos70cos70-sin70sin70= 7
8x-(cos^2(70)+ sin^2(70))=7
8x-1=7 ; 8x=8 ; x=1