" Que."57:" ollel "{x in R:cos2x+2cos^(2)x=2}" al2lul? "

{x inR: cos2x+2cos^(2)x=2} =

{x in R: "cos" 2x + 2"cos"^(2) x = 2} is equal to

{x in R: "cos" 2x + 2"cos"^(2) x = 2} is equal to

(cos2x)/(sin ^(2) x cos^(2) x)

cos 2x + 2cos x is always :-

6tan^(2)x-2cos^(2)x=cos2x if cos2x=

Evaluate the integerals. int (sin 2x)/(a cos ^(2) x + b sin ^(2)x)dx on I sub R \\ {x in R| a cos ^(2)x +b sin ^(2) x =0}.