Exact Trig Values - Hand Trick

The video tutorial introduces a hand trick to easily find exact trigonometric values for angles 0, 30, 45, 60, and 90 degrees. By labeling fingers with these angles, the trick involves bending a finger and counting the fingers above or below it to calculate sine, cosine, and tangent values. The method simplifies the process by using square roots and division, providing a memorable way to recall these values without a table.

What is the first step in using the hand trick to find trigonometric values?

• Memorize the trigonometric table.

• Use a calculator to find the values.

• Count the number of fingers on your hand.

• Label each finger with a different angle.

How do you calculate sine using the hand trick?

• Count the fingers above the bent finger.

• Multiply the number of fingers by two.

• Count the fingers below the bent finger.

• Add the number of fingers above and below.

What is the sine of 90 degrees using the hand trick?

• Square root of 3 over 2

• 1

• 0

• 1/2

How do you determine the cosine value using the hand trick?

• Subtract the number of fingers below from above.

• Count the fingers below the bent finger.

• Count the fingers above the bent finger.

• Multiply the number of fingers by three.

What is the process to find the tangent value using the hand trick?

• Add the number of fingers above and below.

• Flip the hand and count fingers above and below.

• Count the fingers above the bent finger.

• Multiply the number of fingers by two.