This article is a summary of a YouTube video "Trick for doing trigonometry mentally!" by tecmath

How to Easily Memorize Trigonometry: A Simple Trick

TLDRLearn a simple trick to memorize the sine and cosine values of common angles using your hand as a reference. This trick will help you quickly recall trigonometric values without the need for a calculator.

Key insights

🤚By using your hand as a reference, you can easily memorize the sine and cosine values of common angles.

🧠This trick helps you quickly recall trigonometric values without the need for a calculator.

📐The angles 0°, 30°, 45°, 60°, and 90° are commonly used in trigonometry, and this trick makes it easier to remember their sine and cosine values.

🔢To calculate the sine and cosine values, count the number of fingers down from the thumb for sine and up from the thumb for cosine.

The square root of the number of fingers counted is divided by two to calculate the sine and cosine values.

Q&A

Is this trick applicable to all angles?

This trick specifically helps you memorize the values for the angles 0°, 30°, 45°, 60°, and 90°, which are commonly used in trigonometry. However, you can use similar techniques to memorize values for other angles as well.

Is it necessary to use my hand for this trick?

Using your hand as a reference is just one method to easily memorize the sine and cosine values. You can also use other visual aids or mental images to achieve the same result.

Why is it important to memorize trigonometric values?

Memorizing trigonometric values is essential for solving trigonometry problems and understanding the relationships between angles and sides in triangles. It allows for quicker calculations and eliminates the need for repetitive use of a calculator.

Can this trick be used in exams?

Yes, this trick can be used in exams as long as it is allowed by the exam rules. However, it is important to ensure that you have a solid understanding of the underlying concepts to accurately apply the memorized values.

Are there any other similar tricks for memorizing trigonometric values?

Yes, there are various other mnemonic devices and tricks available to help memorize trigonometric values. Experiment with different methods and choose the one that works best for you.

Timestamped Summary

00:00In this video, the TechMath channel introduces a simple trick to easily memorize the sine and cosine values of common angles.

00:57The trick involves using your hand as a reference.

01:32To calculate the sine and cosine values, count the number of fingers down from the thumb for sine and up from the thumb for cosine.

03:17The square root of the number of fingers counted is divided by two to calculate the sine and cosine values.

04:13The trick can also be used to calculate the tangent by dividing the sine value by the cosine value.

04:57This trick is a handy method for quickly recalling trigonometric values without the need for a calculator.

05:00Practice and experiment with different tricks to find what works best for you.