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Anastaziya [24]
3 years ago
8

How do I write 770,070 in expanded form

Mathematics
1 answer:
beks73 [17]3 years ago
8 0
7x100,000+7x10,000+7x10
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If tanA+sinA=m and tanA-sinA=n.prove that m^2-n^2=4√mn
mash [69]

Let a=\tan A and b=\sin A. Then

m^2-n^2=(a+b)^2-(a-b)^2=(a^2+2ab+b^2)-(a^2-2ab+b^2)=4ab

\implies m^2-n^2=4\tan A\sin A

and

mn=(a+b)(a-b)=a^2-b^2

\implies4\sqrt{mn}=4\sqrt{\tan^2A-\sin^2A}

The expression under the square root can be rewritten as

\tan^2A-\sin^2A=\dfrac{\sin^2A}{\cos^2A}-\sin^2A=\sin^2A\left(\dfrac1{\cos^2A}-1\right)=\sin^2A(\sec^2A-1)

Recall that

\sin^2A+\cos^2A=1\implies\tan^2A+1=\sec^2A

so that

\tan^2A-\sin^2A=\sin^2A\tan^2A

and assuming \sin A>0 and \tan A>0, we end up with

4\sqrt{\tan^2A-\sin^2A}=4\tan A\sin A

so that

m^2-n^2=4\sqrt{mn}

as required.

5 0
3 years ago
Mark is using two different baking pans to bake bread for a bake sale.
pav-90 [236]

Answer:

The answer is 410

Step-by-step explanation:

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What is the best estimate of the product 3780 times 2
Leviafan [203]

Answer:

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Step-by-step explanation:

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Given regular pentagon ABCDE, what are the coordinates of vertex C?
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