if f(x)=cospix, find the extact value of a such that f(1)-f(-1)/1-(-1)=cos a.

Elementary Algebra
17th Edition
ISBN:9780998625713
Author:Lynn Marecek, MaryAnne Anthony-Smith
Publisher:Lynn Marecek, MaryAnne Anthony-Smith
Chapter8: Rational Expressions And Equations
Section8.9: Use Direct And Inverse Variation
Problem 498E: If y varies inversely with x and y=11 when x=3 find the equation that relates x and y.
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if f(x)=cospix, find the extact value of a such that f(1)-f(-1)/1-(-1)=cos a.

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