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Ira Lisetskai [31]

4 years ago

7

Derive identity sin(3x) = 3 sinx−4 sin³x

1 answer:

sesenic [268]4 years ago

5 0

$sin3x=3sinx-4sin^3x\\\\L=sin(2x+x)=sin2xcosx+sinxcos2x\\\\=2sinxcosxcosx+sinx(cos^2x-sin^2x)\\\\=2sinxcos^2x+sinxcos^2x-sin^3x\\\\=3sinxcos^2x-sin^3x\\\\=3sinx(1-sin^2x)-sin^3x\\\\=3sinx-3sin^3x-sin^3x\\\\=3sinx-4sin^3x=R$

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PLSS ANSWERR!!!!!!

Fittoniya [83]

Answer:

C. The equation has no solution

Step-by-step explanation:

I hope this helps you out!

5 0

3 years ago

A rectangle has vertices at these corrdinates (1, 2), (3, 2), (1, -8)

Vilka [71]

Answer:

(3,-8)

Step-by-step explanation:

Graph the points on the coordinate plane. Since a rectangle has equal sides with 90 degree angles, the last point will be below (3,2) at the same level as (1,-8). This point is (3,-8).

3 0

3 years ago

Sorry again what is 9,576,297 in word form

belka [17]

Answer:

Nine-million,five hundred seventy-six thousand, two hundred ninety-seven

6 0

3 years ago

Does anyone know the answer to this please ?

andriy [413]

Answer:

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8 0

3 years ago

Isabelle, who is 62 inches tall, is standing beside a tree and casts a 93 inch shadow on the ground. The shadow of the tree she

Illusion [34]

Given:

Height of Isabelle = 62 inches

Shadow of Isabelle = 93 inches

Shadow of tree = 279 inches

To find:

The height of the tree.

Solution:

Let height of tree be x.

Ratio of height to shadow for Isabelle and tree are

$\dfrac{\text{Height of Isabelle}}{\text{Shadow of Isabelle}}=\dfrac{62}{93}$

$\dfrac{\text{Height of tree}}{\text{Shadow of tree}}=\dfrac{x}{279}$

The shadow of Isabelle and tree are proportional to their shadows. So, both ratios must be equal.

$\dfrac{x}{279}=\dfrac{62}{93}$

Multiply both sides by 279.

$x=\dfrac{62}{93}\times 279$

$x=62\times 3$

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Therefore, the height of tree is 186 inches.

8 0

4 years ago