How to memorize mutual relation of trigonometric functions.
take advantage of radioactivity administration mark.
take advantage of radioactivity administration mark.
reciprocal relationship: diagonal
1 and 4, 3 and 6, 2 and 5
1 and 4, 3 and 6, 2 and 5
Squared relationship
To prevent radiation leakage using the following formula to spin it locked! The risk of radiation leakage know it, do not say.
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