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Neporo4naja [7]
3 years ago
8

Prove the following identity. sin 3θ = 3 sin θ − 4 sin3 θ

Mathematics
1 answer:
jarptica [38.1K]3 years ago
5 0
I'll work in x because I'm on my phone.

Proof: LHS = sin3x = sin(2x + x)
= sin2x cosx + cos2x sinx
= 2sinxcos^2x + cos^2x sinx - sin^3x
= 2sinx (1 - sin^2x) + sinx (1 - sin^2x) - sin^3x
= 2sinx - 2sin^3x + sinx - sin^3x - sin^3x
= 3sinx - 4sin^3x = RHS
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Answer:not sure sorry

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3 years ago
(05.08)Solve for x: 7 over 8 minus 1 over x equals 3 over 4.
NemiM [27]

If you are asking 7/8 - 1/x= 3/4,

first put 3/4 to 6/8 to make it easier.

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8 0
3 years ago
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OlgaM077 [116]

Answer:

5x+4y=49.50, where:

x is the price per sub

y is the price per drink

Step-by-step explanation:

From the information provided, you can say that the result of adding up the price per sub for the quantity plus the price per drink for the quantity is equal to 49.50 that is the total amount spent, which can be expressed as:

5x+4y=49.50, where:

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5 0
3 years ago
I do not understand this problem helpppppp
Mademuasel [1]

Answer:

same I'm with u!?

Step-by-step explanation:

I need help on that to pls help smart person I no ur out the some were hurry pls :(

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The circle with center C was used as a model for a swimming pool. The length of <img src="https://tex.z-dn.net/?f=%5Coverline%7B
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Answer:

314.16

Step-by-step explanation:

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3 years ago
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