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<title>Group</title>
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<tspan x="296.5" y="166">x</tspan>
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<text font-size="14" font-weight="normal" fill="#BABABA">
<tspan x="132.5" y="14">y</tspan>
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<tspan x="82" y="166">-a</tspan>
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<tspan x="207" y="166">a</tspan>
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<tspan x="118" y="110">S₁</tspan>
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<tspan x="176" y="110">S₂</tspan>
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<tspan x="240.5" y="103">y=f(x)</tspan>
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<tspan x="166" y="202">In the case of an even function </tspan>
<tspan x="166" y="215">(symmetric with respect to the </tspan>
<tspan x="166" y="228">y-axis), we have S₁ = S₂. </tspan>
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