Rewrite the expression as a sum or difference a) sin52.5° sin97.5° b)prove the identity [(sin10x)/ (sin9x+sin x)] = (cos5x)/(cos4x)
Rewrite the expression as a sum or difference a) sin52.5° sin97.5° b)prove the identity [(sin10x)/ (sin9x+sin x)] = (cos5x)/(cos4x)
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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1. Rewrite the expression as a sum or difference
a) sin52.5° sin97.5°
b)prove the identity
[(sin10x)/ (sin9x+sin x)] = (cos5x)/(cos4x)
2. Use the dum to product identities to rewrite each expression
a)( cos (pi/2)) +( cos+(5pi)/12)
b) if sinA=(3/5) with A in QI and cos B=(-5/13) with B in QIII, find tan (A + B) by using the formula
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