# Proof of cos(A-B)=cosAcosB+sinAsinB Sum and Difference Identities for PDF

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Included in this zip folder are 4 PDF files. 1 is the proof, 1 is an assignment and 2 are student 1 page printables. A brief description of each:

The proof is a 32 page file. The identity cos(A-B)=cosAcosB+sinAsinB is proved. The distance formula is used to derive this identity based on a rotated angle in the unit circle. The student must previously know:
1. The definition of sine
2. The definition of cosine
3. The Pythagorean Identities
4. Expand a binomial
The 1st 11 slides are free in the preview section.

Printable #1 is 1 page. This is for the proof. The appropriate pictures are included for the student to follow along and formulate the proof.

Printable #2 is a 1 page reference of trig identities. The following identities are on the reference:
1. Odd/Even Identities
2. Cofunction Identities
3. Sum and Difference Identities
4. Half Angle Identities
5. Pythagorean Identities
6. Double Angle Identities

Assignment #1 is a 15 question multiple choice assignment. The student must recognize the sum and difference identities for sine, cosine and tangent. It is on 1 page for easy printing. If you desire, it can be used at socrative.com and the socrative share number is included in the file.

Thank you for looking
Total Pages
33 pages
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Teaching Duration
1 hour
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\$1.25