Trigonometric Hand Trick:
This is an easy way to remember the values of common values of trigonometric functions in the
first quadrant. It’s a lengthy explanation, but once you know this by heart, you can use this trick
for all four quadrants. All you need is your non-dominant hand.
Step 1: Hold out your non-dominant hand.
Step 2: “Assign” the following values to your fingers.
If your non-dominant hand is your left
hand…
If your non-dominant hand is your right
hand…
Step 3: Find a trig problem.
For example: cos (π/6)
Step 4: Hold down the finger assigned for that angle.
For example: Hold down your ring finger for π/6.
Step 5: Know the following formulas.
sin 𝜃 =
√𝑏𝑜𝑡𝑡𝑜𝑚 𝑓𝑖𝑛𝑔𝑒𝑟𝑠
2
cos 𝜃 =
√𝑡𝑜𝑝 𝑓𝑖𝑛𝑔𝑒𝑟𝑠
2
tan 𝜃 =
√𝑏𝑜𝑡𝑡𝑜𝑚 𝑓𝑖𝑛𝑔𝑒𝑟𝑠
√𝑡𝑜𝑝 𝑓𝑖𝑛𝑔𝑒𝑟𝑠
“Bottom fingers” refer to how many fingers are “below” the finger you’ve held down. “Top
fingers” refer to how many fingers “above” the finger you’ve held down. Your thumb counts.
Step 6: Calculate the values for your trig expression using the appropriate formula.
For example: When you hold down your ring finger, there is 1 finger below your ring finder
(your pinkie), and there are 3 fingers above your ring finger (your thumb, your index finger, and
your middle finger.) Therefore, cos (π/6) =
√3
2
. If you need sine, sin (π/6) =
√1/2=1/2
So This is how it Works
Hope You Like it!
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0:00 - Introduction
0:22 -Trick
0:34 - Sin Trick
2:02 - Cosec Trick
2:47 - Cos Trick
3:24 - Sec Trick
3:59 - Tan Trick
4:35 - Cot Trick
5:16 - Thanks
Disclaimer: This video is meant for educational purpose only, we do not claim rights over any media used All credit go to their respective owners.
Thank You...
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