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Question #f0bb6

1 Answer

Aug 4, 2016

$cos(x/2)=0.894$
$sin(x/2)=-0.447$

Explanation:

$tanx=-4/3$
or
$x=tan^-1(-4/3)$
or
$x=-53.13$
or
$x/2=-26.57$
So
$cos(x/2)=cos(-26.57)$
$cos(x/2)=0.894$ ===============Ans $1$

$sin(x/2)=sin(-26.57)$
$sin(x/2)=-0.447$ ===============Ans $2$

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