Question

Extreme values of
\rm \: 4 \cos( {x}^{2} ) . \cos \bigg( \dfrac{ \pi}{3} + {x}^{2} \bigg). \cos \bigg( \dfrac{ \pi}{3} - {x}^{2} \bigg)4cos(x2).cos(3π​+x2).cos(3π​−x2)
over R , are

a] -1 , 1

b] -2 , 2

c] -3 , 3

d] -4 , 4​

Answer 1

d is the correct answer

Answer 2

Answer:

(b) is the correct answer...

hope it is helpful to you...