3 years ago

Isolationism, FDR wins

1 answer:

3 0

Answer:

Many leaders of the Democratic Party saw in Roosevelt an attractive mixture of ... and a shaper of public opinion, observed acidly of Roosevelt

Explanation:

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23. Find the exact value of cos(20) knowing that: *

Kaylis [27]

Answer:

$\cos(2\theta) = 0$

Explanation:

Given

$\sin(\theta) = -\frac{\sqrt 2}{2}$

$270^o < \theta < 360^o$

Required

$\cos(2\theta)$

Recall that:

$\sin^2(\theta) + \cos^2(\theta) =1$

Substitute: $\sin(\theta) = -\frac{\sqrt 2}{2}$

$(-\frac{\sqrt 2}{2})^2 + \cos^2(\theta) =1$

$\frac{1}{2} + \cos^2(\theta) =1$

Collect like terms

$\cos^2(\theta) =1-\frac{1}{2}$

$\cos^2(\theta) =\frac{1}{2}$

$\cos(2\theta)$ is calculated as:

$\cos(2\theta) = \cos^2(\theta) - \sin^2(\theta)$

So, we have:

$\cos(2\theta) = \frac{1}{2} - (-\frac{\sqrt 2}{2})^2$

$\cos(2\theta) = \frac{1}{2} - \frac{2}{4}$

$\cos(2\theta) = \frac{1}{2} - \frac{1}{2}$

$\cos(2\theta) = 0$

7 0

3 years ago