3 years ago

What id the relationship between 0.04 and.004

Mathematics

2 answers:

Katena32 [7]3 years ago

8 0

They're both decimals.

natali 33 [55]3 years ago

3 0

There both decimals. But the value is different.

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Double angle identity. Just 5 questions. Really need help as my teacher has been frustrated with me

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The double angle identities are

$\sin(2x)=2\sin x\cos x$

$\cos(2x)=\cos^2x-\sin^2x$

Then

$2\sin\dfrac\pi6\cos\dfrac\pi6=\sin\left(\dfrac{2\pi}6\right)=\sin\dfrac\pi3$

$\cos^2\dfrac\pi{10}-\sin^2\dfrac\pi{10}=\cos\left(\dfrac{2\pi}{10}\right)=\cos\dfrac\pi5$

The second identity together with the Pythagorean identity, $\sin^2x+\cos^2x=1$ , gives us another equivalent expression:

$\cos^2x-\sin^2x=\cos^2x-(1-\cos^2x)=2\cos^2x-1$

$2\cos^2(0.5)-1=\cos(2\cdot0.5)=\cos1$

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Step-by-step explanation:

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