Question

cos 60 градусов-4 sin 45градусов

Answer 1

$\displaystyle \large\bf \cos60 {}^{ \circ} - 4 \sin45 {}^{ \circ} = \frac{1}{2} - 4 \cdot \frac{ \sqrt{2} }{2} = \boxed{ \frac{1}{2} - 2 \sqrt{2} }.$