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Trig Equations (corrected)
Contributed by: Plesek
Solve 0 ≤ x < 2∏.
cos x =
∏/6, 5∏/6
∏/6, 11∏/6

∏/3, 2∏/3

∏/3, 5∏/3

√3
2
Solve 0 ≤ x < 2∏.
cot 2x =
∏/4, 3∏/4
∏/4, 5∏/4

∏/4, 3∏/4, 5∏/4, 7∏/4

∏/8, 3∏/8, 5∏/8, 7∏/8

0
Solve 0 ≤ x < 2∏.
2csc2x + 3cscx - 2 = 0
∏/6, 5∏/6
7∏/6, 11∏/6

∏/3, 2∏/3

∏/3, 5∏/3

Solve 0 ≤ x < 2∏.
2sin2x + 3 = 4
∏/4, 3∏/4
∏/4, 3∏/4, 5∏/4, 7∏/4

∏/3, 2∏/3

∏/3, 2∏/3, 4∏/3, 5∏/3

Solve 0 ≤ x < 2∏.
tan2x - 2tanx + 1 = 0
∏/4

∏/4, 3∏/4

∏/4, 5∏/4

∏/4, 3∏/4, 5∏/4, 7∏/4

Solve 0 ≤ x < 2∏.

sin3x - 1 = 0

∏/2, 3∏/2
∏/2, 5∏/2, 9∏/2

∏/6, 5∏/6

∏/6, 5∏/6, 3∏/2

Solve 0 ≤ x < 2∏.
secx = -√2
∏/4, 3∏/4
∏/4, 5∏/4

3∏/4, 5∏/4

5∏/4, 7∏/4

Use graphing calculator.  Solve 0 ≤ x < 2∏.

Round answers to TWO decimal places.

-2sin2x - 5sinx = 3

4.71

-4.71

0.52

0.52, 2.62

Use graphing calculator.  Solve 0 ≤ x < 2∏.

Round answers to TWO decimal places.

sec x = 5

1.30

5.00

1.37, 4.91

1.37, 4.91, -1.37, -4.91

Use graphing calculator.  Solve -2∏ ≤ x < 2∏.

Round answers to TWO decimal places.

-x - 4cosx = 0

2.13, 3.60

-1.25, 2.13, 3.60

0.52, 2.62

-0.52, 0.52, 2.62

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