Select all the correct answers. Which two strategies belong to the revision phase of writing?
Check that the sequence of events makes logical sense.
Brainstorm for thoughts and ideas on a memoir topic.
Modify the writing in response to feedback from peers.
Identify the audience and write down the purpose of the memoir.
List the people in the memoir and some characteristics to describe them.

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Ответ:

jurnee77

20.05.2022

English

$\dfrac{6\sqrt{2}+\sqrt{7}}{12},\ \dfrac{-3-2\sqrt{14}}{12}$

Step-by-step explanation:

Given

x and y is in the fourth quadrant

$\sin x=-\dfrac{1}{3}\\\\\cos y=\dfrac{3}{4}$

we know,

$\cos (x-y)=\cos x\cos y+\sin x\sin y\\\sin (x+y)=\sin x\cos y+\cos x\sin y$

using $\sin ^2\theta +\cos^2 \theta =1$

$\Rightarrow \cos x=\dfrac{2\sqrt{2}}{3}\\\\\Rightarrow \sin y=-\dfrac{\sqrt{7}}{4}$

$\Rightarrow \cos(x-y)=(\dfrac{2\sqrt{2}}{3})\times (\dfrac{3}{4})+(-\dfrac{1}{3})\times (-\dfrac{\sqrt{7}}{4})=\dfrac{6\sqrt{2}+\sqrt{7}}{12}\\\\\\\Rightarrow \sin (x+y)=(-\dfrac{1}{3})\times \dfrac{3}{4}+\dfrac{2\sqrt{2}}{3}\times (\dfrac{-\sqrt{7}}{4})=\dfrac{-3-2\sqrt{14}}{12}$

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