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" Prove that "cos((pi)/(4)+x)+cos((pi)/(...

" Prove that "cos((pi)/(4)+x)+cos((pi)/(4)-x)=sqrt(2)cos x

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Prove that cos((pi)/(4)+x)+cos((pi)/(4)-x)=sqrt(2)cosx

Prove that, cos((pi)/(4)+x)+cos((pi)/(4)-x)=sqrt(2)cosx .

Prove that quad cos((pi)/(4)+x)+cos((pi)/(4)-x)=sqrt(2)cos x

Prove that cos((3pi)/(4)+x)-cos((3pi)/(4)-x)=-sqrt(2)sinx

Prove that : cos((pi)/4+x)+cos((pi)/4-x)=sqrt(2)cosx

prove that sin((pi)/(4)+x)+sin((pi)/(4)-x)=sqrt(2)cos x

cos((3pi)/(4)+x)-cos ((3pi)/(4)-x)=-sqrt(2) sin x

cos((3pi)/(4)+x)-cos((3pi)/(4)-x) = -sqrt(2)sinx

cos((3pi)/(4)+x)-cos((3pi)/(4)-x) = -sqrt(2)sinx

Prove that cos ((pi)/(4) + x) + cos ((pi)/(4) -x) = sqrt2 cos x