Trigonometry Hand Trick: Count Fingers & Take Root for Exact Values in 5 Sec | Sir Gaurav Arora

Trigonometry Hand Trick: Count Fingers & Take Root for Exact Values in 5 Sec | Sir Gaurav Arora

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The Trigonometry table is now very easy to build without pen and paper. With this Trigonometry Hand Trick, you can create the trigonometry table in your mind itself.

You can easily find trigonometric ratios like sin, cos, tan, cosec, sec and cot for different angles 0 degree, 30 degree, 45 degree, 60 degree and 90 degree just by using your hand.

Focus on your hand. There are five fingers and angles are assigned as: Thumb = 0 degree, Index = 30 degree, Middle = 45 degree, Ring = 60 degree, Little finger = 90 degree.

✔️ Formula 1:
sin θ = √(fingers below) / 2
For example, at 30 degree, index finger is selected. Fingers below = 1
So, sin 30° = √1 / 2 = 1/2
Similarly you can find all values for different angles.

✔️ Formula 2:
cos θ = √(fingers above) / 2
Using this formula you can also find cos values for all angles.

With this hand trick you can easily find trigonometric values, do mental calculations and solve exam questions without pen and paper.

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This trick is very useful for SSC, Defence, Banking, Railway and all competitive exam students.

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