Remembering the Trigonometry Ratios

I base the exact values on the following descending/ascending rule which I personally find quite easy to remember once you know it: cos ( π / 2) = sin ( 0) = 0 / 2 = 0 cos ( π / 3) = sin ( π / 6) = 1
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Introduction To Trigonometry

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How to memorize the definitions of the trig functions

Image mnemonic to help remember the ratios of sides of a right triangle. The sine, cosine, and tangent ratios in a right triangle can be remembered by representing them as strings of letters

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