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Yuliya22 [10]
4 years ago
5

I NEED HELP!! WILL MAKE BRAINLIEST!!

Mathematics
1 answer:
riadik2000 [5.3K]4 years ago
4 0
P=2l+2w
l=13 w=7
p=2(13)+2(7) 
p=40 inches
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By writing sin 3x = sin(2x+x), show that sin 3x = 3 sin x - 4 sin^3 x.
Ksju [112]

Given the trigonometry expression:

sin 3x = sin(2x+x),

In trigonometry identity;

Sin(A+B) = sinAcosB + cosAsinB

The expression above will then become;

sin(2x+x) =sin2xcosx+cos2xsinx\\sin(2x+x) =2sinxcosxcosx + (1-2sin^2x)sinx\\sin(2x+x) =2sinxcos^2x + (1-2sin^2x)sinx\\

Recall that sin^2x + cos^x = 1, hence;

sin(2x+x) =2sinx(1-sin^2x)+ (1-2sin^2x)sinx\\Expand\\sin(2x+x) =2sinx-2sin^3x+ sinx-2sin^3x\\sin(2x+x) =2sinx + sinx-2sin^3x-2sin^3x\\sisn(2x+x) = 3sinx-4sin^3x

This shows that sin3x =3sinx-4sin^3x (Proved!)

Learn more here: brainly.com/question/7331447

8 0
3 years ago
Someone please help me quick! Pleaseee
Nuetrik [128]

Answer:

B

Step-by-step explanation:

Reflect x-axis means (x,y) becomes (x, -y)

Shrink by 1/3 means f(x) = x becomes f(x) = 1/3x

Up 4 units means f(x) = x becomes f(x)= x + 4

So lets put that together

f(x) = \sqrt{x}

f(x) = -\sqrt{x}

f(x) = -\frac{1}{3} \sqrt{x}

f(x) = -\frac{1}{3} \sqrt{x} + 4

8 0
3 years ago
2 times the difference of one-third of a number and 3
Eddi Din [679]

Answer:2(x/3-3) or 2(3-x/3)

Step-by-step explanation:

3 0
3 years ago
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A rectangle is measured 6.5 cm by 7.8 cm .
mote1985 [20]

Answer:

3.24%

Step-by-step explanation:

Percentage error =[ (|calculated value  - actual value) / actual value] x 100

calculated area = length x width

6.5 x 7.8 = 50.7

[(|50.7 - 52.4|] / 52.4] x 100 = 3,24

7 0
3 years ago
Angle A is a right angle in △ABC. Which side is opposite angle C? side BC side AB side AC
Hunter-Best [27]

answer is side AB

I'm not 100% sure, just a guess

I hope it helps tho

8 0
3 years ago
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