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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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The equation y =
-Dominant- [34]

Answer:

The  constant of proportionality k = 12

Hence, option A is true.

Step-by-step explanation:

We know that when 'y' varies directly with 'x', we get

y ∝ x

y = kx

Where 'k' is called the constant of proportionality.

In our case,

The given equation is

y = 12x

comparing with the equation y = kx, we can say

k = 12 which is the constant of proportionality.

Therefore, we conclude that:

The  constant of proportionality k = 12

Hence, option A is true.

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3 years ago
Solve for x. Please look at the picture and answer it. Thank you.
SVEN [57.7K]

Answer:

\tt x=21

Step-by-step explanation:

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2 years ago
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Step-by-step explanation:

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6 0
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bearhunter [10]

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