Ask question

Ask question

All categories

2 years ago

12

Prove the following identities. cos(3pi/s+x)=sinx

1 answer:

kari74 [83]2 years ago

3 0

$\cos \left(\frac{3\pi}{2}-x \right)=\sin x \\ \\ =\cos \left(\frac{3\pi}{2} \right)\cos x -\sin \left(\frac{3\pi}{2} \right) \sin x \\ \\ =0\cos x -(-1)(\sin x) \\ \\ =\sin x$

You might be interested in

Can someone help me find the scientific notation?

Lapatulllka [165]

Remember to evaluate the ten times to 16

7 0

3 years ago

Less expensive and cleaner than power plants that use fossil fuels, why are they not used on a larger scale?

guajiro [1.7K]

If your talking about solar power its because its just not practical solar power doesnt put out nearly enough power for us to be able to run widespread as of yet new and more efficient solar power inc

3 0

4 years ago

Read 2 more answers

Solve :(use unitary method)

andre [41]

Answer:

a. 8

b. 114

Step-by-step explanation:

a.

36/6 = 48/x

36x = 288

x = 8

b.

12/72 = 19/x

1/6 = 19/x

x = 114

8 0

3 years ago

Pls help i have a d in algebra

Step2247 [10]

The awnsey too this question is 1/12

3 0

3 years ago

Which expression is equivalent to -1.3 - (-1.9)−1.3−(−1.9)minus, 1, point, 3, minus, left parenthesis, minus, 1, point, 9, right

RideAnS [48]

Answer:

Choise B: $-1.3+1.9$

Step-by-step explanation:

For this exercise you must remember the multiplication of signs:

$(+)(+)=+\\(-)(-)=+\\(-)(+)=-\\(+)(-)=-$

By definition, equivalent expression have the same value.

Then, you can find an equivalent expression to the expression provided in the exercise by simplifying it.

So, given:

$-1.3 - (-1.9)$

To simplify it, you can distribute the negative that is located outside of the parentheses (in order to eliminate the parentheses).

Applying this procedure, you get the following equivalent expression:

$-1.3 - (-1.9)=-1.3+1.9$

Therefore, as you can notice, the expression obtained matches with the one shown in Choice B.

8 0

3 years ago