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Anastasy [175]
3 years ago
9

Solve for 0-360 degrees. 2cos^2x + cosx = 0

Mathematics
1 answer:
Ann [662]3 years ago
4 0

Answer:

60, 90, 270, 300 degrees

Step-by-step explanation:

a = cos(x)

2(a^2) + a = 0

a(2a + 1) = 0

a = 0 OR 1/2

so...

cos(x) = 0 OR cos(x) = 1/2

x = 90 or 270 OR x = 60 or 300

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