If cosxcos(pi/7)+sinxsin(pi/7)=root2/2

Step-by-step explanation:

Cosine Of A Sum Of Angles

The cosine of the sum of angles can be expressed in terms of the individual angles as follows

The cosine of the subtraction of angles is

Since we have

We can see it's equivalent to the cosine of the subtraction of angles, thus

Completing the equation we have

We know

And also

So we have two possible solutions

Thus, the first solution is

And the second solution is

the answer to this question is in the pic

answer is d-29

step-by-step explanation:

since you didn't include the picture, i can give you the description so you know how to pick the correct answer. the third quartile of a data is always shown in a box plot. in the middle of your graph should be a box. the third quartile is the value that goes with the far right edge of the box.