20-08-2019
Mathematics

contestada

Evaluate sin^2(pi/4)-cos^2(pi/4) and simplify whenever possible.

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LammettHash LammettHash

20-08-2019

By the double angle identity for cosine,

[tex]\sin^2\dfrac\pi4-\cos^2\dfrac\pi4=-\cos\dfrac\pi2=0[/tex]

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