Question

Calculați Cos 45*•sin 45*- radical din 3 sin 60* • Cos 60*

Answer 1

Explicație pas cu pas:

$cos45 \times sin45 - \sqrt{3} \times sin60 \times cos60$

$= \frac{ \sqrt{2} }{2} \times \frac{ \sqrt{2} }{2} - \sqrt{3} \times \frac{ \sqrt{3} }{2} \times \frac{1}{2}$

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

$= \frac{ - 1}{4}$