Sum and Difference Angles Trig Identities

Assume A and B are positive acute angles. If sinA=15/17 and cosB=4/5, find the cos(A - B).

• 3/8

• 8/17

• -13/85

• 77/85

Write the following expression as the sine, cosine, or tangent of an angle.
cos(175)cos(55)+sin(175)sin(55)

• sin(120)

• cos(120)

• cos(230)

• sin(230)

Use the angle sum/difference identity to find the exact value of

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Use the angle sum/difference identity to find the exact value of

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• cos (A-B)

• cos (A+B)

• sin (A-B)

• sin (A+B)

• tan (A+B)

• tan(A-B)

• none of these

Tags

P.9-12.5.M

• cos (A-B)

• cos (A+B)

• sin (A-B)

• sin (A+B)

• tan (A+B)

• tan(A-B)

• none of these

Tags

P.9-12.5.M

• cos (A-B)

• cos (A+B)

• sin (A-B)

• sin (A+B)

• tan (A-B)

• tan(A+B)

• none of these

Tags

P.9-12.5.M

• cos (A-B)

• cos (A+B)

• sin (A-B)

• sin (A+B)

• tan (A+B)

• tan(A-B)

• none of these

Tags

P.9-12.5.M

• cos (A-B)

• cos (A+B)

• sin (A-B)

• sin (A+B)

• tan (A+B)

• tan(A-B)

• none of these

Tags

P.9-12.5.M