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Answer :

[tex]\boxed{\sf cos(A+B)=cosAcosB-sinAsinB}[/tex]

Now

[tex]\\ \sf\longmapsto cos(x+1)[/tex]

  • A=x
  • B=1

[tex]\\ \sf\longmapsto cosxcos(1)-sinxsin(1)[/tex]

View image Аноним