Trigonometry (11th Edition)
Trigonometry (11th Edition)
11th Edition
ISBN: 9780134217437
Author: Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher: PEARSON
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Fundamentals of Trigonometric Identities
Trigonometric Identities are the equalities that involve trigonometry functions and hold for all the values of variables given in the equation.
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Use the given information to find the exact value of the expression.
 
sin α =  5/13, α lies in quadrant II, and cos β =  15/17, β lies in quadrant I Find sin (α - β).
 
sin α = - 24/25, α lies in quadrant IV, and cos β = - (sqrt21)/5, β lies in quadrant III Find sin (α - β).
 
sin θ = 8/17, θ lies in quadrant II Find tan 2θ.
 
tan α =  5/12, α lies in quadrant III, and cos β = - 3/5, β lies in quadrant II Find sin (α + β).
 
tan θ =  5/12, θ lies in quadrant III Find sin 2θ.
 
 
Express the sum or difference as a product.

cos 2x - cos 4x
 
sin 2x - sin 4x
 
 
Thank you!!!
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