Question

2 sin(-П/2) -4 cos 2П/3 ​

Answer 1

Ответ:

0

Пошаговое объяснение:

$\displaystyle sin \bigg (\frac{-\pi}{2} \bigg ) = -1\\\\\\cos\bigg (\frac{2\pi}{3} \bigg ) = -\frac{1}{2}=-0,5 \\\\2*(-1)-4*(-0,5) = -2 +2=0$

Answer 2

Let's evaluate the expression step by step:

1. sin(-π/2) = -1 (since sine of -π/2 is -1)
2. cos(2π/3) = -0.5 (cosine of 2π/3 is -0.5)

Now, plug these values back into the original expression:

2 * (-1) - 4 * (-0.5) = -2 + 2 = 0

So, the value of the expression 2 * sin(-π/2) - 4 * cos(2π/3) is 0.

Answer 3

Let's break down the expression step by step:

1. sin(-π/2) = -1
2. cos(2π/3) = -1/2

Now we can plug these values into the expression:

2 * (-1) - 4 * (-1/2)

Simplifying further:

-2 + 2 = 0

So, the value of the expression 2 * sin(-π/2) - 4 * cos(2π/3) is 0.