Exact Trigonometric Ratio proof

This video explains how to work out the exact trig ratios with proof which is required for GCSE Maths. Watch the video, subscribe, take notes, then go to our website for some practice...

Please see our other video on a way to "remember" it.
https://www.youtube.com/watch?v=oUb8PiWGCt8

Please visit https://maths-school.co.uk for more revision

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To remember trig ratios, it's best to have a clear method. I think this is by far the easiest way, and covers all Sin Cos and Tan.

This easy table method will support you in being able to remember the exact trigonometric ratios or exact trig values for special angles - almost instantly!
Find the sin, cos and tan values for 0, 30, 45, 60 and 90 degrees without needing a calculator

Become a trigonometry master by filling in a table - it's as easy as 0,1,2,3....4

Support us by subscribing to our channel - click here: https://bit.ly/2Y3ggGh

Please visit https://maths-school.co.uk for more revision