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1 year ago

18+6=+=__ /\ 2 4

Mathematics

2 answers:

Anna71 [15]1 year ago

5 0

18+ 6 equals 14 just add

Arturiano [62]1 year ago

3 0

Answer:

18 pluse 6 equals 14

Step-by-step explanation:

just add

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-10+3m+5 can someone please help me do two step equations

Orlov [11]

Answer:

3m-5

Step-by-step explanation:

combine like terms

5 0

2 years ago

Rewrite with only sin x and cos x.

Annette [7]

Option A

$\cos 3 x=\cos x-4 \cos x \sin ^{2} x$

Solution:

Given that we have to rewrite with only sin x and cos x

Given is cos 3x

$cos 3x = cos(x + 2x)$

We know that,

$\cos (a+b)=\cos a \cos b-\sin a \sin b$

Therefore,

$\cos (x+2 x)=\cos x \cos 2 x-\sin x \sin 2 x$ ---- eqn 1

We know that,

$\sin 2 x=2 \sin x \cos x$

$\cos 2 x=\cos ^{2} x-\sin ^{2} x$

Substituting these values in eqn 1

$\cos (x+2 x)=\cos x\left(\cos ^{2} x-\sin ^{2} x\right)-\sin x(2 \sin x \cos x)$ -------- eqn 2

We know that,

$\cos ^{2} x-\sin ^{2} x=1-2 \sin ^{2} x$

Applying this in above eqn 2, we get

$\cos (x+2 x)=\cos x\left(1-2 \sin ^{2} x\right)-\sin x(2 \sin x \cos x)$

$\begin{aligned}&\cos (x+2 x)=\cos x-2 \sin ^{2} x \cos x-2 \sin ^{2} x \cos x\\\\&\cos (x+2 x)=\cos x-4 \sin ^{2} x \cos x\end{aligned}$

$\cos (x+2 x)=\cos x-4 \cos x \sin ^{2} x$

Therefore,

$\cos 3 x=\cos x-4 \cos x \sin ^{2} x$

Option A is correct

7 0

2 years ago

Question:4x²-9 answer:

statuscvo [17]

Step-by-step explanation:

4x^2-9

=(2x)^2 -3^2

=(2x+3) (2x-3)

Hope this helps you.

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2 years ago

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My name is Ann [436]

Answer:

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Step-by-step explanation:

Area is cm2 Circumference is cm

4 0

2 years ago

Read 2 more answers

Order of operations. Need to find the unknown number. Help?

klio [65]

Answer:

m = 18

k = 4

g = 50

s = 18

y = 9

f = 19

Step-by-step explanation:

7 0

2 years ago

Read 2 more answers

18+6=__+__=__ /\ 2 4

18+6=+=__ /\ 2 4