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cos((pi)/(4)+A)+cos((pi)/(4)-A)=sqrt(2)c...

cos((pi)/(4)+A)+cos((pi)/(4)-A)=sqrt(2)cos A

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

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

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

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: cos((3pi)/(4)+A)-cos((3pi)/(4)-A)=-sqrt(2)sinA

Prove that: cos((3pi)/(4)+A)-cos((3pi)/(4)-A)=-sqrt(2)sinA

Prove that: cos(pi/4+A)+cos(pi/4-A)=sqrt(2)cosA

Prove that: cos(pi/4+A)+cos(pi/4-A)=sqrt(2)cosA

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