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Thepotemich [5.8K]
3 years ago
5

Pease Help. Will mark Brainliest

Mathematics
2 answers:
steposvetlana [31]3 years ago
6 0

Answer:

the answer is b

Step-by-step explanation:

snow_lady [41]3 years ago
3 0

Answer:

The Answer will be B

Step-by-step explanation:

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Luden [163]

Answer:

>this is your answer this is write

8 0
3 years ago
Show that cos(3theta) = 4cos3(theta) − 3cos (theta).
Delvig [45]

<u>Step-by-step explanation:</u>

To prove:

\cos 3\theta=3\cos^3 \theta-3\sin^2 \theta\cos \theta

Identities used:

\cos(A+B)=\cos A\cos B+\sin A\sin B      ......(1)

\sin 2A=2\sin A\cos A        ........(2)

\cos 2A=\cos^2A-\sin^2 A    .......(3)

\sin^2A+\cos^2A=1       .......(4)

Taking the LHS:

\Rightarrow \cos 3\theta=\cos (\theta +2\theta )

Using identity 1:

\Rightarrow \cos (\theta +2\theta )=\cos \theta \cos 2\theta-\sin \theta \sin 2\theta

Using identities 2 and 3:

\Rightarrow \cos \theta (\cos ^2\theta-\sin^2 \theta )-\sin \theta (2\sin \theta \cos \theta )\\\\\Rightarrow \cos^3\theta -\sin^2\theta \cos \theta -2\sin^2 \theta \cos \theta \\\\\Rightarrow \cos^3\theta -3\sin^2\theta \cos \theta

Using identity 4:

\Rightarrow \cos^3\theta -3(1-\cos^2\theta) \cos \theta\\\\\Rightarrow \cos^3\theta-3\cos \theta+3\cos^3\theta\\\\\Rightarrow 4\cos^3\theta -3\cos \theta

As, LHS = RHS

Hence proved

5 0
3 years ago
Sam climbed 650 steps in 12 1/2 minutes. How many steps did Sam climb per minute
In-s [12.5K]

Answer:

52 steps per minute

Step-by-step explanation:

Just divide. 650 ÷ 12.5 =52

4 0
3 years ago
3ft minus 5 inches to decimal feet. Report to the nearest hundredth of a foot.
almond37 [142]
2.58 feet is the nearest hundredth of a foot.  It goes on to 2.583 with the 3 repeating
3 0
4 years ago
Twelve eggs cost $2.04. How much would 18 eggs cost?
lyudmila [28]
1 dozen eggs cost 2.04 and your adding another half dozen so your adding half the price of the dozen egg.
2.04/2=1.02
2.04+1.02=3.06
So 18 eggs costs $3.06

Hope this helps!! :))
7 0
3 years ago
Read 2 more answers
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