1.

Cos²180/16+cos²1260/16+cos²900/16+cos²900/16

Answer»

COS^2 180/16+cos^2(90-180/16)+cos^2(900/16)+cos(90-900/16)

=cos^2(180/16)+sin^2(180/16)+cos^2(900/16)+sin^2(900/16)

=1+1

=2



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