+0  
 
0
35
1
avatar

Hello, can you give me a detailed solution for this example: (cos(75) - sin(75))^2

 Jun 13, 2022
 #1
avatar+13728 
+1

Trigonometric subtraction

 

Доброе утро русский друг!


\(cos\ (x)-sin\ (x)=\sqrt 2\ sin(\frac{\pi}{4}-x)\\ (cos\ (75^\circ)-sin\ (75^\circ))^2=(\sqrt 2\ sin(\frac{\pi}{4}-\frac{75^\circ \cdot\pi}{180^\circ}))^2\\ \color{blue}=(-0,5\sqrt{2})^2=0,5\)

laugh  !

 Jun 13, 2022
edited by asinus  Jun 13, 2022
edited by asinus  Jun 13, 2022

9 Online Users

avatar