3 years ago

I NEED HELP ITS ALMOST DUE!!

Mathematics

2 answers:

slava [35]3 years ago

6 0

Answer:

B) 9

Step-by-step explanation:

rise over run and simplify

Vinil7 [7]3 years ago

5 0

I think the value of w would be 9

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Free piont (so this will not get delete) 7x8x3=

SVEN [57.7K]

Answer:

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Step-by-step explanation:

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Rus_ich [418]

Answer:

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Show that cos(3x) = cos3(x) − 3 sin2(x)cos(x). (Hint: Use cos(2x) = cos2(x) − sin2(x) and the cosine sum

otez555 [7]

<u>Step-by-step explanation:</u>

To prove:

$\cos 3x=\cos^3x-3\sin^2 x\cos x$

Identities used:

$\cos(A+B)=\cos A\cos B+\sin A\sin B$ ......(1)

$\sin 2A=2\sin A\cos A$ ........(2)

$\cos 2A=\cos^2A-\sin^2 A$ .......(3)

Taking the LHS:

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Using identity 1:

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Using identities 2 and 3:

$\Rightarrow \cos x(\cos ^2x-\sin^2 x)-\sin x(2\sin x\cos x)\\\\\Rightarrow \cos^3x-\sin^2x\cos x-2\sin^2 x\cos x\\\\\Rightarrow \cos^3x-3\sin^2x\cos x$

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Hence proved

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3 years ago

Help please!!!!!!!!!

ozzi

The formula is 3x+14=32.
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Lucy took three tests. If her median score was 86, her mean score was 87, and the range was 13, what were her three test scores?

sveticcg [70]

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4 years ago