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Alex
3 years ago
8

Prove (sinxsiny-cosxcosy)(sinxsiny+cosxcosy) =sin^2x-cos^2y

Mathematics
1 answer:
3241004551 [841]3 years ago
7 0

Step-by-step explanation:

Recall that \sin^2x + \cos^2x = 1

(\sin x \sin y - \cos x \cos y)(\sin x \sin y + \cos x \cos y)

= \sin^2 x \sin^2 y - \cos^2 x \cos^2 y

= \sin^2 x (1 - \cos^2 y) - \cos^2 x \cos^2 y

= \sin^2 x - \sin^2 x \cos^2y - \cos^2x \cos^2y

= \sin^2x - (\sin^2x + \cos^2x)\cos^2y

= \sin^2x - \cos^2y

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The amount of unexplained variance in a relationship between two variables is called?
ser-zykov [4K]

Answer:

The amount of unexplained variance in a relationship between two variables is called: coefficient of alienation also called coefficient of nondetermination. A positive correlation between two variables would be represented in a scatterplot as. line sloping upwards. .

Step-by-step explanation:

5 0
2 years ago
Ali wants to buy a piano. The piano measures 19/4 ft long. She has a space 5ft long for the piano in her house. Does she have en
KATRIN_1 [288]
19/4 = 4 3/4 ft which is less than 5ft
Yes she has room
6 0
3 years ago
Read 2 more answers
A researcher is interested in determining if the more than two thirds of students would support making the Tuesday before Thanks
Yakvenalex [24]

Answer:

The null hypothesis is, {H₀}: p = 0.66, H₀: p = 0.66 .

The alternative hypothesis is, {Hₐ}: p > 0.66, Hₐ​: p > 0.66

Step-by-step explanation:

Let p represent the proportion of students who are supportive of making the day before Thanksgiving a holiday.

Since two populations are considered, the alternative hypothesis for the difference of the means of the two populations has to be stated.

The proportion of two-third students are supportive of making the day before Thanksgiving a holiday is p = 0.66 obtained as shown below:

The null hypothesis is,

{H₀}:p = 0.66, H₀​: p = 0.66

The alternative hypothesis is,

{Hₐ:p > 0.66, Ha​: p > 0.66

The null hypothesis is, {H₀}: p = 0.66, H₀: p=0.66 .

The alternative hypothesis is, {Hₐ}: p > 0.66, Hₐ​: p > 0.66

3 0
3 years ago
Four movie tickets cost $26.00 . How much do seven movie tickets cost?
sashaice [31]

Answer:

Hi! I suggest reading the explanation, it will help make this equation more simple.

↓↓↓

The answer is $45.50

Step-by-step explanation:

First, divide 26.00 by four. This will give you 6.5, so now you know that each ticket individually costs $6.5 or $6.50.

next, multiple 6.50 by 7.

this will give you 45.5 or $45.50.

double check your answer by dividing 45.50 by 7.

your answer should be 6.5 on a calculator.

that's all! hope this helped.

7 0
2 years ago
Which of the following pairs of numbers has a GCF of 1? 30 and 70 24 and 44 12 and 30 16 and 21
stiv31 [10]
Must be 16 and 21 because we can see

30 and 70 has 10 as factor
24 and 44 has 2 as factor
12 and 30 has 2 as factor and all those factors are greater than one
5 0
3 years ago
Read 2 more answers
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