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cos(π4+x)+cos(π4−x)=a \large \cos { \left( \frac { \pi }{ 4 } +x \right) } +\cos { \left( \frac { \pi }{ 4 } -x \right) } =acos(4π+x)+cos(4π−x)=a
cos(3π4+x)−cos(3π4−x)=b \large \cos { \left( \frac { 3\pi }{ 4 } +x \right) } -\cos { \left( \frac { 3\pi }{ 4 } -x \right) } =bcos(43π+x)−cos(43π−x)=b
a2+b2= ?{ a }^{ 2 }+{ b }^{ 2 }=\ ?a2+b2= ?
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