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3 years ago

A) (7 + 8) - (5 + 9) + 4(2 + 5) =

Mathematics

1 answer:

valkas [14]3 years ago

3 0

I think 41 is correct answer

Step-by-step explanation:

(7+8)-(5+9)+4(2+5)

=15-14+4(10)

=1+40

=41

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Step-by-step explanation:

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3 years ago

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3 years ago

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 ,

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

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

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

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

Multiply it by 2 ,

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Take out 2 common from the numerator ,

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

Simplify ,

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Subtract the numbers ,

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Simplify,

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3 years ago

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Answer:

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3 years ago

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zaharov [31]

Answer:

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Step-by-step explanation:

This answer because they are both right triangles and are near the same size

Hope this helps!

7 0

3 years ago