All categories

3 years ago

Please help!!! Which is not equal to the others?

Mathematics

1 answer:

svetlana [45]3 years ago

7 0

Answer:

Step-by-step explanation:

Given

a cos2x

2sinxcosx = sin2x

2cos²x - 1 = cos2x

1 - 2sin²x = cos2x

b is the expression not equal to the others

---------------------------------------------------------------------------

Note

cos2x = cos²x - sin²x = cos²x - (1 - cos²x) = 2cos²x - 1

cos2x = (1 - sin²x) - sin²x = 1 - 2sin²x

You might be interested in

Which phrase describes an unknown or changeable quantity?

Artist 52 [7]

B i think that because there’s no quantity

7 0

3 years ago

briana house is at (1,6) and jordan house is(5,3) what is one possible path from brianna house to jordan house

Maurinko [17]

Answer:

see the explanation

Step-by-step explanation:

Let

A (1,6)------> location Brianna's house on a map

B (5,3)------> location Jordan's house on a map

we know that

One possible path from Brianna's house to Jordan's house it's a straight line ( the shortest distance)

using a graph tool

see the attached figure

<em>Find the distance points AB</em>

the formula to calculate the distance between two points is equal to

$d=\sqrt{(y2-y1)^{2}+(x2-x1)^{2}}$

substitute the values

$d_A_B=\sqrt{(3-6)^{2}+(5-1)^{2}}$

$d_A_B=\sqrt{(-3)^{2}+(4)^{2}}$

$d_A_B=\sqrt{25}$

$d_A_B=5\ units$

The distance from Brianna's house to Jordan's house is 5 units

6 0

4 years ago

X + y = 3<br> 3x + 4y = 3<br> using substitution how would you get x and y?

laila [671]

Answer:

The solution is: (x, y) = (9, -7)

Step-by-step explanation:

Step 1: Solve one of the equations for either x = or y = . We will solve second equation for y.

x+y=3

y=3-x

Step 2: Substitute the solution from step 1 into the second equation.

3x+4(3-x)=5

Step 3: Solve this new equation.

3x+4(3-x)=5

3x+12-4x=3

-x+12=3

-x=3-12

x=9

Step 4: Solve for the second variable

y=3-x

y=3-9

y=-7

The solution is: (x, y) = (9, -7)

3 0

3 years ago

How do I translate twice r plus 7 is equal to 45 minus r into an equation?

Karo-lina-s [1.5K]

r^2+7=45-r

i think this is the write answer, i havent done that kind of math in awhile.

7 0

3 years ago

2x + 7y + 2x - 8y + x =

eduard

Answer:

5x-y

Step-by-step explanation:

=2x + 7y + 2x - 8y + x

=2x+2x+x+7y- 8y

=5x-y

hey friend hope it's help you...

4 0

3 years ago

Read 2 more answers