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3 years ago

I need help.....plz help...thanks

Mathematics

1 answer:

kvv77 [185]3 years ago

6 0

Answer:

Step-by-step explanation:

X is equal to One so that is why slope 1 and -3

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If sinA=√3-1/2√2,then prove that cos2A=√3/2 prove that

Ivan

Answer:

$\boxed{\sf cos2A =\dfrac{\sqrt3}{2}}$

Step-by-step explanation:

Here we are given that the value of sinA is √3-1/2√2 , and we need to prove that the value of cos2A is √3/2 .

Given :-

• $\sf\implies sinA =\dfrac{\sqrt3-1}{2\sqrt2}$

To Prove :-

• $\sf\implies cos2A =\dfrac{\sqrt3}{2}$

Proof :-

We know that ,

$\sf\implies cos2A = 1 - 2sin^2A$

Therefore , here substituting the value of sinA , we have ,

$\sf\implies cos2A = 1 - 2\bigg( \dfrac{\sqrt3-1}{2\sqrt2}\bigg)^2$

Simplify the whole square ,

$\sf\implies cos2A = 1 -2\times \dfrac{ 3 +1-2\sqrt3}{8}$

Add the numbers in numerator ,

$\sf\implies cos2A = 1-2\times \dfrac{4-2\sqrt3}{8}$

Multiply it by 2 ,

$\sf\implies cos2A = 1 - \dfrac{ 4-2\sqrt3}{4}$

Take out 2 common from the numerator ,

$\sf\implies cos2A = 1-\dfrac{2(2-\sqrt3)}{4}$

Simplify ,

$\sf\implies cos2A = 1 -\dfrac{ 2-\sqrt3}{2}$

Subtract the numbers ,

$\sf\implies cos2A = \dfrac{ 2-2+\sqrt3}{2}$

Simplify,

$\sf\implies \boxed{\pink{\sf cos2A =\dfrac{\sqrt3}{2}} }$

Hence Proved !

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3 years ago

nico put some cupcakes i the oven at 8:55 they need to bake or 25 mins what time do they get took out

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Since an hour has 60 minutes you will take away 5 from 25 and put the 5 on 55 to get 9:00 then you add the rest to get 9:20.

Hope this helps. :)

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3 years ago

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Zinaida [17]

The answer for this is false

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3 years ago

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kodGreya [7K]

Answer:

The ratio is 2:3. 10m:15m is the fraction 10/15. Reduce to 2/3. The ratio is 2:3.

Step-by-step explanation:

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2 years ago

can someone please help me with number 12? there’s only two options and you can see them in the picture.

nataly862011 [7]

Answer:

Step-by-step explanation:

Because it can't be a because if you wanna get P it is 20/16 not 1 /12

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2 years ago