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" 1."cos((3 pi)/(4)+x)-cos((3 pi)/(4)-x)...

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

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

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

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

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

Prove that cos ((3pi)/(4)+x)-cos ((3pi)/(4)-x)=-sqrt2 sin x

Prove the following: (i) cos((3pi)/(4)+x)-cos((3pi)/(4)-x)=-sqrt2 sin x (ii) cos"((pi)/(4)+x)+cos((pi)/(4)-x)=sqrt2 cos x .