Question

cos²30°-sin²30°=cos 60°​

Answer 1

${cos}^{2} 30 = \frac{3}{4 } \\ {sin}^{2} 30 = \frac{1}{4} \\ cos60 = \frac{1}{2}$

Hence, cos²30-sin²30

$=\frac{3}{4}-{1}{4} \\= \frac{2}{4} \\= \frac{1}{2} \\ =cos60$

Answer 2

Step-by-step explanation:

Okkk........ See the attachment