how-is-solution-sgn-cos-21-10-

Question Number 187871 by mustafazaheen last updated on 23/Feb/23

h o w i s s o l u t i o n

sgn (\cos \frac{21}{10}) = ?

Answered by mr W last updated on 23/Feb/23

\frac{21}{10} = 2.1 > \frac{π}{2} b u t < π

\Rightarrow \cos \frac{21}{10} < 0

\Rightarrow s g n (\cos \frac{21}{10}) = - 1

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