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If A= cos^(2) 10^(@) + cos^(2) 50^(@) +...

If ` A= 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

A

C,A,B

B

A,B,C

C

B,A,C

D

C,B,A

Text Solution

Verified by Experts

The correct Answer is:
A
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