In this lesson, we will have mnemonics and songs to help you remember
• Remember SOH-CAH-TOA
SOHCAHTOA, and how use you can use SOHCAHTOA to help you remember the right triangle definitions of the trig functions, assuming that you can remember to spell SOHCAHTOA.
Sin = Opposite/Hypotenuse
Cos = Adjacent/Hypotenuse
Tangent = Opposite/Adjacent
A SOH-CAH-TOA mnemonic: Some Old Horses Can Always Hear Their Owner’s Approach
• Oscar/Had (sin) A/Heap (cos) Of/Apples (tan)The Old Arab Carried A Heavy Sack Of Hay
• ASTC (Where are they positive?)
Which trig functions are positive in each quadrant:
All in Quadrant I,
Sine in Quadrant II,
Tangent in Quadrant III,
Cosine in Quadrant IV.
Mnemonics include “A Smart Trig Class”, “All Students Take Calculus”, “All Stores Take Cash”, and “Aunt Sally Tickles Cobras” (Cats, Camels, Cougars, Chimps, Caribou ...)This video demonstrates the ASTC rule used to determine the sign of the trigonometric function in each quadrant. CAST Rule
We can use a mnemonic like CAST or ASTC - All Students Take Calculus to remember the signs in the 4 quadrants.
Simple Hand Trick for Memorizing Trig Values of Special Angles
Try the free Mathway calculator and
problem solver below to practice various math topics. Try the given examples, or type in your own
problem and check your answer with the step-by-step explanations.
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