1+(cos+630градусов)+sin(2x+810градусов)...

Question

1+(cos+630градусов)+sin(2x+810градусов)
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1-cos(2x-630гр)+sin(2x630гр)

Answer 1

Допустим :
1+сos630° +sin(2x +810°) =1+сos7*180°/2 +sin(720°+(90°+2x))=
1+0+sin(90°+2x)=1+cos2x=2cos²x.