Published by:
CGP EDU Academic Team
Published on: August 12, 2026
If 
and 
then the value of 
, is
Text Solution
Verified by ExpertsThe correct answer is:
-3
(-3)
If 
, find 
Step 1: Use complex form
Let 
.
Step 2: Express sum of triple angles
Use identity: 
Since 
, we get:
Also, 
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