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lana [24]
3 years ago
7

Prove 2SinAsinB =cos(A-B)-cos(A+B)

Mathematics
1 answer:
Leni [432]3 years ago
8 0
Right side of the equation:
cos ( A - B ) - cos ( A + B ) =
= cos A cos B + sin A sin B - ( cos A cos B - sin A sin B ) =
= cos A cos B + sin A sin B - cos A cos B + sin A sin B =
= 2 sin A sin B    -  left side of the equation      ( correct )
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Question 5 <br> show the work please
Pani-rosa [81]

Answer:

D) 27

Step-by-step explanation:

It's a rectangle so the opposite sides are congruent to each other.

<em />

<em>Long Side:</em>

6x + 6 = 42

subtract 6 from both sides:

6x = 36

divide both sides by 6:

x = 6

<em />

<em>Short Side:</em>

5y + 5 = 30

subtract 5 from both sides:

5y = 25

divide both sides by 5:

y = 5

<em />

<em>The Equation:</em>

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substitute in the values:

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do the multiplication:

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add the values together:

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6 0
3 years ago
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Dvinal [7]

Answer: 8 + x = 3

To solve for this, we need to get x by itself on one side of the equation.

Currently, we have 8 being added to x, so we need to perform the opposite order of equations to get rid of 8.

The opposite of +8 is -8, so subtract 8.

Remember, if you add, subract, multiply or divide by any new number, you must do it to both sides of the equation.

8 + x = 3

Subtract 8 from both sides.

8 - 8 = 0

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We're now left with:

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I hope this helps! can u pls give me brainliest

Step-by-step explanation:

3 0
3 years ago
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STatiana [176]

Answer:

1/2D meters

Step-by-step explanation:

I hope this helps

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3 years ago
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