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olasank [31]
3 years ago
15

5. Determine the average rate of change of f(x)=6 cos(2x) – 4 on the interval [pi/4,pi]

Mathematics
1 answer:
Vinil7 [7]3 years ago
7 0

Answer:

-  \frac{8}{\pi}

Step-by-step explanation:

Use slope formula.

Rise over run.

Or

y over x.

\frac{ {y}^{2}  - y {}^{1} }{ {x}^{2} - x {}^{1}  }

Over changes in x value would be - 3/4 pi.

Plug in seepage intervals for x to find y.

6 \cos(2(\pi)  - 4

In the regular function,

\cos(\pi)  = 1

Since our period is 2, it would stay the same since 1x2=2

Since our amplitude is 6, our y value now is 6.

Since our vertical shift is -4, our y value is 2.

So

6 \cos(2(\pi))  - 4 = 2

{x}^{2}  = \pi \:  \:  \:  \:  {y}^{2}  = 2

Let do the other point,

\cos( \frac{\pi}{4} )  =  \frac{ \sqrt{2} }{2}

Our period is 2 so

\frac{ {\pi} }{4}  \times  \frac{2}{1}  =  \frac{\pi}{2}

\cos( \frac{\pi}{2} )  = 0

Multiply this by 6.

It stays 0 then subtract 4 we get

6 \cos(2( \frac{\pi}{4} ))  - 4 =  - 4

Use the earlier formula, slope

\frac{2  + 4}{ -  \frac{3\pi}{4} }  =  -  \frac{8}{\pi}

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