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[" उदाहरणT 15सिद्ध कीजिए: "],[qquad cos(...

[" उदाहरणT 15सिद्ध कीजिए: "],[qquad cos((pi)/(4)+x)+cos((pi)/(4)-x)=sqrt(2)cos 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 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

cos((3pi)/4+x)-cos((3pi)/4-x)=

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

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