Question

Sin2 45 -cos2 60 решите пожалуйста

Answer 1

Ответ:

0,25

Пошаговое объяснение:

sin45° = $\frac{\sqrt{2} }{2}$

cos60° = $\frac{1}{2}$

sin²45° - cos²60° = ($\frac{\sqrt{2} }{2}$)² - ($\frac{1 }{2}$)² = $\frac{2}{4}$ - $\frac{1}{4}$ = 0,25

Answer 2

Sin(2*45) - cos(2*60)

First, let's find the values of sin(90) and cos(120):

sin(90) = 1 cos(120) = -0.5

Now, let's substitute these values into the equation:

sin(2*45) - cos(2*60) = sin(90) - cos(120) = 1 - (-0.5) = 1 + 0.5 = 1.5

So, the solution is 1.5.