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geniusboy [140]
3 years ago
10

Help please algebra 8th grade need to finish ASAP!! A.27 B.33 C.60 D.93

Mathematics
1 answer:
Alex787 [66]3 years ago
7 0
C.60 its the same size and shape as the 60 above it
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Find all solutions to the equation in the interval [0, 2π). cos 4x - cos 2x = 0
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Answer:

See below in bold.

Step-by-step explanation:

cos 4x = 2cos^2 2x - 1 =  2 (2 cos^2 x - 1)^2 - 1

and cos 2x = 2 cos^2 x - 1 so we have:

2 ( 2 cos^2 x - 1)^2 - 1 - (2cos^2 x  - 1) = 0

2 ( 2 cos^2 x - 1)^2 - 2 cos^2 x = 0

(2 cos^2 x - 1)^2 -  cos^2 x = 0

Let c = cos^2 x, then:

(2c - 1)^2 - c = 0

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4c^2 - 5c + 1 = 0

c = 0.25, 1

cos^2 x  = 0.25 gives cos x = +/- 0.5

and cos^2 x = 1 gives cos x = +/- 1.

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7 0
3 years ago
Will give brainliest! Given the 3 lengths of a triangle are 6 in, 8 in, and 11 in. A) Will this make a triangle? B) Will it be a
tigry1 [53]

Answer:

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Step-by-step explanation:

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harkovskaia [24]

Answer:

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Step-by-step explanation:

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3 years ago
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Answer:

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Step-by-step explanation:

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Divide each side by 10

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3 years ago
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