Worksheets · Precalculus

Trig equations worksheet

The calculator gives you one angle. The rest come from knowing where else that ratio takes the same value, which is what the unit circle is for.

Select your difficulty

Pick more than one for a sheet that mixes them.

Free math worksheets at sigmaprep.io/worksheets© 2026 Sigma Prep

Sigma Prep · sigmaprep.io/worksheets

Name

Simple Trig Equations

Date Period

Solve each equation on the interval [0, 2\pi).

  1. 2cos⁡x=2
  2. sin⁡x=−12
  3. cos⁡x=−32
  4. sin⁡x=12
  5. sin⁡x=32
  6. tan⁡x=3
  7. cos⁡x=−1
  8. cos⁡x=0
  9. tan⁡x=33
  10. 2sin⁡x=2
  11. tan⁡x=−33
  12. tan⁡x=−3
  13. 2sin⁡x=−3
  14. sin⁡x=−22
  15. sin⁡x=22
  16. tan⁡x=1
  17. cos⁡x=−12
  18. cos⁡x=12
  19. 2sin⁡x=2
  20. 2sin⁡x=−2

Free math worksheets at sigmaprep.io/worksheets© 2026 Sigma Prep

Sigma Prep · sigmaprep.io/worksheets

Name

Simple Trig EquationsAnswer keyVersion 1

Date Period

Solve each equation on the interval [0, 2\pi).

  1. 2cos⁡x=20
  2. sin⁡x=−127π6, 11π6
  3. cos⁡x=−325π6, 7π6
  4. sin⁡x=12π6, 5π6
  5. sin⁡x=32π3, 2π3
  6. tan⁡x=3π3, 4π3
  7. cos⁡x=−1π
  8. cos⁡x=0π2, 3π2
  9. tan⁡x=33π6, 7π6
  10. 2sin⁡x=2π2
  11. tan⁡x=−335π6, 11π6
  12. tan⁡x=−32π3, 5π3
  13. 2sin⁡x=−34π3, 5π3
  14. sin⁡x=−225π4, 7π4
  15. sin⁡x=22π4, 3π4
  16. tan⁡x=1π4, 5π4
  17. cos⁡x=−122π3, 4π3
  18. cos⁡x=12π3, 5π3
  19. 2sin⁡x=2π4, 3π4
  20. 2sin⁡x=−25π4, 7π4

Free math worksheets at sigmaprep.io/worksheets© 2026 Sigma Prep

How to do these

2cos⁡x+3=0

  1. Cosine is negative root 3 over 2.
  2. The reference angle is pi over 6.
  3. Cosine is negative in the second and third quadrants.

The answer is 5π6, 7π6.

Where students go wrong

Stopping at one answer. On a whole turn a sine or cosine equation almost always has two, and with a multiple of x inside there are more still: the interval gets divided as well.

Also called solving trigonometric equations, sin cos tan equations or solving on 0 to 2pi.

Questions about these worksheets

Yes. Every trig equations sheet is free to print and free to download as a PDF. There is no account to make, no email to hand over and no limit on how many you take.

Yes. The answer key prints on a second page, and you can choose whether it shows each question beside its answer or just the answers in a list.

Yes. Print straight from the page, or download the PDF and print that. The sheet is laid out for paper rather than squeezed off a screen, so there is room to work under each question, and the answer key comes out on its own page.

Precalculus is usually taken around 11th or 12th grade, though schools vary and plenty of students meet it earlier or later. Pick the difficulty rather than the grade: the easy level suits a first lesson on it, the hard level suits review before a test.

Yes, as many as you like. The questions are built fresh each time rather than picked from a fixed set of files, so pressing Generate gives a new sheet. That is what you want for a second class, a retake, or two students sitting next to each other.

That is the closest comparison, and Kuta Software is good software. It is also paid software you install on a computer. These worksheets run in a browser tab for free, with no account and nothing to install. Like Kuta, the trig equations questions are generated when you ask for them rather than pulled from a fixed set of files, so two classes never get the same sheet, and the answer key comes with it.

Yes. There are three levels, and you can tick more than one for a sheet that mixes them, in which case the questions come out easiest first. The harder levels are not just larger numbers: they ask for something the easy ones do not.

Stopping at one answer. On a whole turn a sine or cosine equation almost always has two, and with a multiple of x inside there are more still: the interval gets divided as well.