1.

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 A,B,C is

Answer»

C,A,B
A,B,C
b,a,c,d
C,B,A

Answer :A


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