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Sum and Difference and Double Angle Identities
Sum and Difference and Double Angle Identities
Lesson Overview:
Use sum and difference identities to evaluate trigonometric functions.
Use sum and difference identities to solve trigonometric equations.
Use Double angle identities to evaluate trig functions
Use sum and difference identities to evaluate trigonometric functions.
Use sum and difference identities to evaluate trigonometric functions.
Steps:
- Determine which equation to use
- Plug the variables into the equation
- Solve for RHS
Use sum and difference identities to solve trigonometric equations.
Use sum and difference identities to solve trigonometric equations.
Steps:
- Find x, y, and r for α and β
- Find sin β , cos β , sin α, and cos α
- Plug the numbers into the correct identity formula
- Solve
Use Double angle identities to evaluate trig functions
Use Double angle identities to evaluate trig functions
Steps:
- Find x, y, and r
- Plug numbers into sine Double Identity Equation and Solve
- Plug numbers into cosine Double Identity Equation and Solve
- Plug answers for sine and cosine Double Identities into tangent Double Identity Equation and Solve
Real World Example
Real World Example
SAT Practice
SAT Practice
SAT Practice Problem for Double Angle Identities
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