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Lynch

The value of sin²30°- cos²30°=?​

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\longrightarrow \sf { \sin}^{2} 30\degree-{ \cos}^{2} 30\degree\\\\ \longrightarrow \sf {\bigg(\frac{1}{2}\bigg) }^{2}-\bigg({ \frac{ \sqrt{3} }{2} \bigg)}^{2} \\\\ \longrightarrow \sf \frac{1}{4}-\frac{3}{4} \\\\ \longrightarrow \sf \frac{1 - 3}{4} \\\\\longrightarrow \sf -\frac{2}{4} \\\\\longrightarrow \sf-\frac{1}{2}

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Vadim
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