Question

cos^2 7 1/2 degrees - cos^2 37 1/2 degrees​

Answer 1

Answer:

$\cos {}^{2} (7 \frac{1}{2} ) - \cos {}^{2} (37 \frac{1}{2} ) \\ \sin(7 \frac{1}{2} + 37 \frac{1}{2} ) \sin(37 \frac{1}{2} - 7 \frac{1}{2} ) \\ \sin(45) \sin(30) \\ ( \frac{1}{ \sqrt{2} } )( \frac{1}{2} \\ \frac{1}{2 \sqrt{2} }$