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Write an expression that completes a fundamental identity for the following function.

sin(−z) = ?

Choose the correct answer below.

 

A. -sin z

B. sin z

C. - cos z

D. cos z

 May 11, 2021
 #1
avatar+34306 
+1

Try this     pick a number say...20

 

sin 20 = ?       then try sin (-20)= ?      what do you find ?

 May 11, 2021
 #2
avatar+775 
+1

$\sin(90)=1$

$\sin(-90)=-1$

 

$\sin(270)=-1$

$\sin(-270)=1$

 

Apparently, $\sin(-n) = - \sin(n)$

 May 11, 2021

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