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Trigonometry calculations (with and without calculator)

Use exact values in calculations in solving trig problems

5 hand-picked video lessons for this topic, each checked for relevance and clarity, graded by difficulty and labelled by depth. Press play to watch — nothing loads from YouTube until you do.

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Grade 4–7 Core 🇬🇧 UK

Exact Trig Values - GCSE Maths

1st Class Maths 226K views

Clear GCSE guide to learning and using the exact trig values with SOHCAHTOA.

Jump to 0:10Which values do you need to learn?0:42How to memorise all of the values 5:131 mark exam questions (usually on foundation)5:45Using exact values with SOHCAHTOA - Example 1 7:22Using exact values with SOHCAHTOA - Example 2 8:43Deriving the values of sin(45), cos(45) and tan(45)

Grade 4–7 Core 🇬🇧 UK

Non-Calculator Trigonometry - New Question Style | Exact Values | Grade 5 Crossover | TGMT

The GCSE Maths Tutor 76K views

UK teacher walks through the new non-calculator exact-value trig questions step by step.

Grade 5–8 Core 🇺🇸 US

How To Find The Exact Values of Trig Functions

The Organic Chemistry Tutor 1.1M views

Finds exact trig values using the 30-60-90 and 45-45-90 reference triangles.

Grade 4–6 Recap 🇬🇧 UK

Exact Trig Values - Hand Trick | Trigonometry | Maths | FuseSchool

FuseSchool - Global Education 1.2M views

The hand trick for remembering exact trig values in seconds.

Grade 3–6 Core 🇬🇧 UK

Trigonometry | SOH CAH TOA | Sin, Cos, Tan

Cognito 509K views

Crisp SOHCAHTOA basics for finding missing sides and angles with a calculator.

Jump to 2:05Using SOH CAH TOA 3:11Example 1: Finding an Unknown Angle 5:57Example 2: Finding an Unknown Side