How do you evaluate $Cos(pi/4) -(pi/4)sin(pi/4)$ ?

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Answer 1 · 2016-04-11T04:58:31

$r(pi)=sqrt(2)/2-pi/4sqrt(2)/2=sqrt(2)/2(1- pi/4)=sqrt(2)/2((4- pi))/4$

Given : $r(pi/4)=cos(pi/4) -(pi/4)sin(pi/4)$
Evaluate:
Solution :
$r(pi)=sqrt(2)/2-pi/4sqrt(2)/2=sqrt(2)/2(1- pi/4)=sqrt(2)/2((4- pi))/4$

How do you evaluate Cos(pi/4) -(pi/4)sin(pi/4)Cos(pi/4) -(pi/4)sin(pi/4)?