(cos(x) + cos(y))^2 + (sin(x) - sin(y))^2 Remove the brackets
cos^2(x) + cos^2(y) + 2cos(x)*cos(y) + sin^2(x) - 2(sin(x)*sin(y) + sin^2(y) Combine these two in bold to make 1 because sin^2(x) + cos^2(x) = 1
1 + cos^2(y) + 2cos(x)*cos(y) - 2*sin(x)*cos(y) + sin^2(y)
These two in bold also make 1
2 + 2cos(x)*cos(y) - 2*sin(X)*sin(y) Bring out a common factor of 2
2 +2(cos(x)*cos(y) - sin(x)*sin(y) )
but cos(x+y ) = cos(x)*cos(y) - sin(x)*sin(y)
2 + 2* cos(x + y) is your final answer.
Answer:
B. 4
Step-by-step explanation:
The maximum number of teams the teacher can divide the class into is 4. I got it right on ED2020.
Answer:
b. infinite solutions
Step-by-step explanation:

Therefore, the graphs are the same.
If the graphs of the equations are the same, then there are an infinite number of solutions that are true for both equations.
Answer:
Area = 67.5 m²
Perimeter = 69 m
Step-by-step explanation:
<h3>Area of triangle:</h3>
b = 27 m & h = 5 m


<h3>Perimeter of triangle:</h3>
Perimeter = sum of all sides
= 27 + 34 + 8
= 69 m
Let y represent the original price of a game.
<span>Ella purchased a game that was on sale 12% off which means that the new price of the game is 88% of the original price, so:
</span>

Next, t<span>he sales tax in her county is 6%, which means that the the now price is 106% to the original price, so:
</span>

. As a result, the final cost can represent under the form of 0.9328y. Hope it help!