1.

IfA= cos^(2) 10^(@) + cos^(2) 50^(@) + cos^(2) 70^(@) , B= sin^4"" (3pi)/8 - cos^(4)""(3pi)/8 ,C=cos^(2)""(pi)/(10)+ cos^(2)""(2pi)/5+cos^(2)""(3pi)/5+cos^(2)""(9pi)/(10) then the descending order is

Answer»

C,A,B
A,B,C
B,A,C
C,B,A

ANSWER :A


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