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lina2011 [118]
3 years ago
11

HELP ME PLEASEEEEEEEEE

Mathematics
1 answer:
OLga [1]3 years ago
4 0

Answer:

is it 56 units²? if not sorry

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Can anyone explain those marked steps in case (iii)
Tema [17]
\cos\dfrac{3x}2=\cos\left(\dfrac\pi2+\dfrac x2\right)
\implies \dfrac{3x}2=2n\pi+\dfrac\pi2+\dfrac x2

follows from the fact that the cosine function is 2\pi-periodic, which means \cos x=\cos(2\pi+x). Roughly speaking, this is the same as saying that a point on a circle is the same as the point you get by completing a full revolution around the circle (i.e. add 2\pi to the original point's angle with respect to the horizontal axis).

If you make another complete revolution (so we're effectively adding 4\pi) we get the same result: \cos x=\cos(4\pi+x). This is true for any number of complete revolutions, so that this pattern holds for any even multiple of \pi added to the argument. Therefore \cos x=\cos(2n\pi+x) for any integer n.

Next, because \cos(-x)=\cos x, it follows that \cos x=\cos(2n\pi-x) is also true for any integer n. So we have

\implies \dfrac{3x}2=2n\pi\pm\left(\dfrac\pi2+\dfrac x2\right)

The rest follows from considering either case and solving for x.
5 0
2 years ago
can anyone explain the a+b+c or is it a+b=c? i don't know.....can someone please explain it to me? Pls no links
Ludmilka [50]
It’s a plus b equals c
8 0
3 years ago
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Simplify the following:<br><br> <img src="https://tex.z-dn.net/?f=%5Cfrac%7B8x%5E2y%5E2-10xy%5E3-22y%7D%7B2y%5E2%7D" id="TexForm
alisha [4.7K]

Answer:

 \frac{4x^2y-5xy^2-11}{y}  

Step-by-step explanation:

\frac{8x^2y^2-10xy^3-22y}{2y^2}

=\frac{8x^2y-10xy^2-22y}{2y}

=\frac{4x^2y-5xy^2-11}{y}

[RevyBreeze]

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I need help on Dividing Fractions?
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You have to write the problem you need help with.
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Is this relation a function? Justify your answer.
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Answer:

i don't now

ok

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3 years ago
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