Trigonometric Functions and Casio FX 991ex

This video tutorial covers the use of the Casio FX 991ex scientific calculator for solving trigonometric problems, focusing on areas where it excels over Desmos. It explains how to find exact values of sine, cosine, and tangent, both in degrees and radians, and demonstrates how to calculate coordinates on the unit circle. The lesson concludes with a brief mention of additional resources and tutoring services.

What is the main focus of the lesson in the video?

• Using the Casio FX 991ex for general math problems

• Using the Casio FX 991ex for digital SAT math unit circle problems

• Using the Casio FX 991ex for algebra problems

• Using Desmos for all math problems

What should you do first to ensure your calculator is ready for degree mode calculations?

• Press shift and setup, then select angle unit and choose gradient

• Press AC and clear

• Press shift and setup, then select angle unit and choose degree

• Press shift and setup, then select angle unit and choose radian

What is the exact value of sine 120 degrees using the Casio FX 991ex?

• 1/2

• Root 3 over 2

• Negative 1/2

• Root 2 over 2

What is the exact value of cosine 240 degrees using the Casio FX 991ex?

• 1/2

• Negative root 3 over 2

• Root 2 over 2

• Negative 1/2

What is the exact value of tangent 240 degrees using the Casio FX 991ex?

• Root 3

• Negative root 3

• 1

• Negative 1

Why is the Casio FX 991ex preferred over Desmos for certain calculations?

• It is more user-friendly

• It has a larger screen

• It provides exact values instead of decimals

• It is faster

How do you set the Casio FX 991ex to radian mode?

• Press shift and setup, then select angle unit and choose degree

• Press shift and setup, then select angle unit and choose radian

• Press AC and clear

• Press shift and setup, then select angle unit and choose gradient

What is the exact value of sine 3π/4 radians using the Casio FX 991ex?

• Root 2 over 2

• Negative 1/2

• Root 3 over 2

• 1/2

What is the exact value of cosine 7π/6 radians using the Casio FX 991ex?

• Negative root 3 over 2

• 1/2

• Negative 1/2

• Root 2 over 2

What is the formula for finding the x-coordinate on a unit circle?

• x = R sine Theta

• x = sine Theta

• x = cosine Theta

• x = R cosine Theta