Question about SoftMath Algebrator - Algebra Homework Solver (689076614429)
Use the fact that cos(pi/4)=sin(pi/4)= 1/square root(2). Trigonometric identity cos(a+b)=cos(a)cos(b)-sin(a)sin(b).
Posted on Jan 22, 2012
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Posted on Jan 02, 2017
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