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maw [93]
2 years ago
10

Which of the following are solutions to the equation 2cos2x-1=0

Mathematics
1 answer:
loris [4]2 years ago
8 0

Answer:

x = π/4 and 5π/4

Step-by-step explanation:

Given the expression;

2cos²x - 1 = 0

2cos²x = 0+1

2cos²x = 1

cos²x = 1/2

cos x = ±√1/2

cos x = ±0.7071

x = arccos(±0.7071)

x = ±45 degrees

Convert to radians

Sence 180° = π rad

45°  = x

x = 45π/180

x = π/4

If x = -45°

Since cos is negative in the 3rd quadrant

x = 180 + 45

x = 225°

x = 225π/180

x = 45π/36

x = 5π/4

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stealth61 [152]
Yes. The lines would insert in quadrant 1. At (1,7)
4 0
3 years ago
7.54×10³ im so stuck
LekaFEV [45]

Answer:

7540

Step-by-step explanation:

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3 0
2 years ago
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Hitman42 [59]
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8 0
3 years ago
In the number 38. 7165, what number is in the hundredths position?
Sati [7]

Answer:

1

Step-by-step explanation:

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4 0
2 years ago
She feeds her lion 6/9 of a pound of food at each meal.how may 1/9 cups of food does her lion eat.
densk [106]

Answer:

18

Step-by-step explanation:

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