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Natasha2012 [34]
2 years ago
12

Express cos^2 x in terms of cos2x. Hence, express f(x) = 6cos^2 x - 4sin 2x in the form R cos (2x + Y degrees) + p where R, y an

d p are constants. Find the maxium and minimum values of f(x) and sketch its graph in the domain -180 <= x <= 360
Mathematics
1 answer:
Lady bird [3.3K]2 years ago
8 0
2cos^2 x = 1 + cos 2x
cos^2 x = 1/2(1 + cos 2x)
f(x) = 6cos^2 x - 4 sin 2x = 6(1/2(1 + cos 2x) - 4 sin 2x = 3 + 3cos 2x - 4sin 2x
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A farmer leans a 12-ft ladder against a barn. The base of the ladder is 3 ft from the barn. To the nearest tenth, how high on th
DENIUS [597]

The barn, the ground, and the ladder form a right triangle. If we represent the height on the barn by y, then the Pythagorean theorem tells us

... hypotenuse² = (side1)² + (side2)²

... (12 ft)² = (3 ft)² + y² . . . . . . . . . . . . fill in given information

... 144 ft² - 9 ft² = y² = 135 ft² . . . . . .subtract (3 ft)²

... y = 3√15 ft ≈ 11.6 ft . . . . . . . . . . . take the square root

The ladder reaches 11.6 feet high on the barn.

4 0
3 years ago
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pierre owns a bike shop.he needs to order 12 replacments parts that each cost $9.75.the factory offers free shipping for orders
galina1969 [7]
He will not need to pay a shipping fee because 12*9.75 is more than $100.
8 0
2 years ago
Tell whether (-1,2) is a solution of 8x+y&gt;-6
harina [27]

Answer:

Not a solution.

Step-by-step explanation:

(x, y)

(-1, 2)

Substitute the x and y values in the expression with the point given.

8x + y > -6

8(-1) + 2 > -6

-8 + 2 > -6

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Since our final value has to be greater than -6 but is instead equal to -6, the solution is not true.

3 0
2 years ago
The number is odd. the number is more than 7 times 3. the number is less than 5 times 5. the myster number is what?
Ksju [112]
23 is your answer i think
4 0
3 years ago
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Lines sand tare perpendicular. If the slope of line sis 5, what is the slope of<br> line t?
Sveta_85 [38]

Answer:

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Step-by-step explanation:

Perpendicular lines have slopes that are the opposite reciprocal of one another.

The slope of line t is the opposite reciprocal of the slope of line s:

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  slope of t = -1/5

6 0
3 years ago
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