Published by:
CGP EDU Academic Team
Published on: August 13, 2026
If cos –1 
+ cos –1 
= 
then x is equal to :
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Sol. cos –1 
cos –1 
⇒ 
= 
⇒ 6 = 
square both side
36 = 144x 4 – 81x 2 – 64x 2 + 36
⇒ 144x 4 = 145x 2
⇒ x 4 = 
⇒ x = ± 
∴ x > 
hence x = 
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