Trigonometric Identities
Trigonometric identities are the tools that turn an unmanageable expression into a workable one. This quiz covers the Pythagorean identities, the angle sum and difference formulas, and the three forms of the double angle formula for cosine.
Several questions ask you to simplify rather than recall — the expression is given and you name what it reduces to.
Calculations were checked by hand; one answer key was corrected before publication.
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What This Quiz Covers
- The Pythagorean identity and its two derived forms
- Angle sum and difference formulas
- Double angle formulas for sine and cosine
- The tangent addition formula
- Cofunction identities
- Simplifying expressions using identities
Sample questions3 of 13 shown
Q1
Which of the following is the correct Pythagorean identity?
Q2
What is the angle sum formula for sin(A + B)?
Q3
What is cos(A - B) equal to?
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