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4 years ago

Can anyone please help : show that cos^{2} (θ)= 1 + cos(2θ) / 2 , using the compound angle formula

Mathematics

1 answer:

iragen [17]4 years ago

6 0

Answer:

Below

Step-by-step explanation:

Let's prove that cos^2(O) = 1+ cos(2O)/2

We khow that cos(2O) = 2 cos^2-1

● cos(2O) = 2 cos^2-1

Add one to both sides:

● cos(2O) +1 = 2 cos^2-1+1

● cos(2O) +1 = 2 cos ^2

Divide both sides by 2

● [cos(2O)+1]/2 = cos^2

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goldfiish [28.3K]

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Step-by-step explanation:

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3 years ago

-3x >=9 using the symbols ( [ { in set builder notation the solution set is

arsen [322]

The given inequality :

$-3x\ge9$

Simplify :

Multiply both side by (-1) and reverse the inequality :

$\begin{gathered} -3x\ge9 \\ (-1)(-3x)\leq(-1)9 \\ 3x\leq(-9) \end{gathered}$

Divide the inequality by 3:

$\begin{gathered} \frac{3x}{3}\leq\frac{(-9)}{3} \\ x\leq(-3) \end{gathered}$

i.e. x is less than or equal to (-3)

Solution : x ≤ (-3)

so,

x is lies in the half open interval of - infinity to (-3)

Interval Notation : (-infinity, -3]

Answer:

Solution : x ≤ (-3)

Interval Notation : (-infinity, -3]

4 0

1 year ago

Hello pls help plsss and thx!

mixas84 [53]

Answer B

Distribute the 2

8 0

3 years ago

Play A's longest home run distance is 500 ft. There are 5280 ft in 1 'll how many home runs would player b need to hit at his lo

Korolek [52]

Answer

500*b > 5280

Solution

To get this to an answer, you have to divide by 500

b > 5280/500

b must be greater than 10.56 which is the answer to 5280/500

So you should say that he needs to hit 11 home runs, because 0.56 home runs is not possible.

Answer

11 home runs

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3 years ago

Find the values of x,y, and z and the perimeter

Nataly_w [17]

X i think that one is

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3 years ago