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3 years ago

Please can someone prove this equation

Mathematics

1 answer:

zubka84 [21]3 years ago

6 0

Answer:

see explanation

Step-by-step explanation:

Using the trigonometric identity

sin²x + cos²x = 1

Consider the left side

2cos²A - 1 ← replace 1 by sin²A + cos²A

= 2cos²A - ( sin²A + cos²A)

= 2cos²A - sin²A - cos²A

= cos²A - sin²A = right side ⇒ verified

You might be interested in

1/2 of 30 = 1/4 of ??

Leto [7]

Answer:60

Step-by-step explanation:

⅟₂ of 30=15

¼ of 60=15

<h3>Half of thirty is 15 so u need to know what ¼ of something makes 15 so all u have to do is times 15 by 4 and there got ur answer this will not go for every question tho</h3>

4 0

3 years ago

What is the volume?<br> 2 mm<br> 8 mm<br> 4 mm<br> cubic millimeters

shutvik [7]

Answer:

64 mm³

Step-by-step explanation:

I am assuming there was a photo to go with this problem

However the general formula to find volume is usually V = l×w×h

It does not matter which measurement is which because they all get multiplied together.
However assigning a name to each unit of measurement we will denoted the length (l) as 2 mm, the width (w) as 8 mm, and the height (h) as 4 mm
Plugging these values into the formula we get: V = (2)(8)(4) = 64 mm³

6 0

3 years ago

If 3^(2x1)=3^(x+5), what is the value of x?

tatyana61 [14]

Answer:

its -3

Step-by-step explanation:

since the bases are equal then the powers are equal

${3}^{2} = {3}^{x + 5} \\ \\ 2 = x + 5 \\ x = - 3$

4 0

3 years ago

In its first year of operation, Big Lake Camp had 40 campers. This year’s attendance was 180% of the first year’s. How many camp

ale4655 [162]

Answer:

D(72)

Step-by-step explanation:

to find this do 40 + 40 to get 200 percent of the original year when subtract 20 percent of 40 to get 72

3 0

3 years ago

Which set of ordered pairs represents a function? {(2, –2), (1, 5), (–2, 2), (1, –3), (8, –1)} {(3, –1), (7, 1), (–6, –1), (9, 1

LiRa [457]

Answer:

{(3, –1), (7, 1), (–6, –1), (9, 1), (2, –1)}

Step-by-step explanation:

{(3, –1), (7, 1), (–6, –1), (9, 1), (2, –1)}

this set represent a function because there is one input (x) for the output(y)

(no repetition for x)

6 0

4 years ago