Is Goblins free for teachers?

Yes. Goblins offers a generous free tier that includes 1 live feedback assignment per week, insights on student mastery and replays, and the ability to upload your own content. The Max plan adds unlimited assignments, superadaptive mode, grade exports, standards growth reports, and SSO/LMS integration, with per-student pricing for schools and districts.

How does Goblins work?

Three simple steps: (1) Share an assignment from thousands of standards-aligned topics using a share code. (2) Students speak and draw their thinking naturally, and Goblins responds with Socratic questioning that sounds just like their teacher. (3) Teachers get real-time formative insights showing what students struggle with and suggestions to inform instruction.

Does Goblins prevent cheating?

Yes. Goblins uses a purpose-trained AI model that evaluates cheating signals in real time. It can detect when students are copying answers, using external tools inappropriately, or not genuinely working through problems. Copy-pasting answers is also blocked.

Can I use my own voice with Goblins?

Yes. Teachers can record their voice and take a selfie to create a custom 3D avatar in about 30 seconds. Students then hear help in their own teacher's voice and see a familiar face, making the experience more personal and effective.

What math levels does Goblins cover?

Goblins covers math from Grade 5 through AP Calculus, including thousands of standards-aligned topics. Teachers can also upload their own content for custom assignments at any level.

Is Goblins FERPA compliant?

Yes. Goblins is FERPA and state compliant. Student data privacy and security are a top priority.

Does Goblins support English Language Learners?

Yes. Goblins supports 30+ languages so teachers don't have to translate every worksheet. It is especially helpful for ELL students who need accessible math instruction in their native language.

9.3.4.2

Apply the trigonometric ratios sine, cosine and tangent to solve problems, such as determining lengths and areas in right triangles and in figures that can be decomposed into right triangles. Know how to use calculators, tables or other technology to evaluate trigonometric ratios.

Example Problems

Integrate:

\int 9\sin(x) dx

Integrate:

\int 4\sin(x) dx

Integrate:

\int 14\cos(x) dx

Khan Academy Resources

Solving for a side in right triangles with trigonometry Trigonometric ratios in right triangles Right triangle trigonometry review Solve triangles using the law of cosines Solve triangles using the law of sines Solve for a side in right triangles General triangle word problems Relate ratios in right triangles Trig values of π/6, π/4, and π/3 Right triangle trigonometry word problems Trig identities from reflections and rotations Solving for a side in right triangles with trigonometry Trigonometric ratios in right triangles Sine equation algebraic solution set Solving for a side with the law of cosines Solving for a side with the law of sines Trig word problem: stars Cosine equation solution set in an interval Cosine equation algebraic solution set Solving for an angle with the law of sines Trig challenge problem: trig values & side ratios Cosine, sine and tangent of π/6 and π/3 Solving for an angle with the law of cosines Using complementary angles Trig word problem: complementary angles

1-on-1 AI tutoring aligned to 9.3.4.2. Instant help for students, real-time insights for teachers.

Used in classrooms by 100,000+ students at Baltimore County, Plano ISD, Deer Valley USD, KIPP, and districts nationwide.

Free for teachers, forever →