Pre-Cal Unit 3 Review

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1 point

Solve: tanx/2 - tanx/3 = -1/6

3π/4, 7π/4, π/4, 5π/4

0, π

3π/4, 7π/4

π/4, 3π/4

1 point

Solve tan^4x - tan^2x = 0

No answers - all undefined because you are dealing with tangent

0, π, π/4, 5π/4

π/2, 3π/2

0, π, π/4, 5π/4, 7π/4, 3π/4

1 point

Solve sin^2x = 0.4

+/- 1.7894

+/- 2.4566

+/- 0.6847

+/- 0.8934

1 point

Solve 3sinx = 2cos^2x

π/6, 5π/6

o, π

π/3, 4π/3

3π/2, π/2

1 point

Find the exact value of cos(-225)º
(Use sum/difference formula to prove what you know off the unit circle).

None of these are correct

√2/2

√3/2

-√2/2

1 point

Solve 4cos^2x - 4cosx = -1

o, π

π/6, 11π/6

3π/2, π/2

π/3, 5π/3

1 point

Solve 2 cosxsinx - cosx = 0

π/6, π/2, 7π/6, 3π/2

π/6, π/2, 5π/6, 3π/2

0, 3π/2, π/6

π/3, 2π/3, 4π/3, 5π/3

1 point

Simplify cos(x - π)

sinx

cosx

-cosx

-sinx

1 point

Solve 2sin^2x + 3sinx = 2

π/6, 5π/6

π/4, 3π/4

7π/6, 11π/6

π/3, 4π/3

10.

1 point

Find the exact value of tan(225)º
(Use sum/difference formula to prove what you know off the unit circle).

-1

Undefined

11.

1 point

Find the exact value of sin(23π/12)

-√6 + √2 ÷ 4

√6 - √2 ÷ 4

-√6 - √2 ÷ 4

√6 + √2 ÷ 4

12.

1 point

Solve 4 cosx + 2 = 0

π/3, 2π/3

2π/3, 0

2π/3, 4π/3

0, π

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