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nika2105 [10]
3 years ago
15

Which expression is equivalent to:

Mathematics
1 answer:
nadya68 [22]3 years ago
4 0

Answer:

from the given equation

Step-by-step explanation:

eqn 1 = eqn 3= eqn 4

these all are equivalent

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Review the steps of the proof of the identity
koban [17]

Answer:

step 2

and then also in step 3 compensating the error in step 2

Step-by-step explanation:

I think I just answered this for another post.

sin(a - b) = sin(a)cos(b) - cos(a)sin(b)

so, step 1 is correct :

sin(A - 3pi/2) = sin(A)cos(3pi/2) - cos(A)sin(3pi/2)

but step 2 suddenly and incorrectly switched that central "-" to a "+".

yes, sin(3pi/2) = -1, but that is still an explicit factor in step 2. so it was not used to flip the central operation from subtraction to addition, and therefore this change was a mistake.

then, in step 3, another error was made by just ignoring the "-" sign of "-1" and still keeping the central "+" operation. this error compensated for the error in step 2 bringing us back by pure chance to the right result.

5 0
2 years ago
Describing trends in scatter plots1The graph below shows the relationship between life expectancyand infant mortality rate in a
rosijanka [135]
Given

The graph of the infant mortality rate and life expectancy is given in the scatter form.

Explanation

To determine the relation between the life expectancy and infant mortality rate ,

use the given graph.

From the graph given, it is clear that as the infant mortality rate increases then the life expectancy decreases.

Therefore, the countries with high mortality rates tended to have shorter life expectancies.

Answer

Hence the correct option is B.

5 0
2 years ago
How much does 1 lemon cost if 6<br>lemons are $2.99?​
steposvetlana [31]

Answer: About 50 cents 0.50

Step-by-step explanation: 2.99 / 6 = 0.50

4 0
4 years ago
Read 2 more answers
Help meeee:eeeeeeeeee:(
hichkok12 [17]

Answer:

A. 92 cm

Step-by-step explanation:

Please let me know if you want me to add an explanation as to why this is the answer/how I got this answer. I can definitely do that, I just wouldn’t want to write it if you don’t want me to :)

3 0
3 years ago
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What is -1/2+-1/5+-5x+3/10+3/2=
Anastaziya [24]

Answer:

-5x + 11/10

Step-by-step explanation:

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3 years ago
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