The Student Room Group
Reply 1
2cos²x = 2sinxcosx + 1
2cos²x = sin2x + 1
now cos²x = (1+cos2x)/2
then 1+cos2x = sin2x + 1
cos2x = sin2x
tan2x = 1
2x = pi/4
x = pi/8
Reply 2
ryan750
2cos^2x = 2sinxcosx +1

from 0 - 360


1+cos2x=sin2x+1
sin2x=cos2x
tan2x=1
2x=45 or 225
x=22.5 or 112.5
Reply 3
oh i didnt see the range of values!!! and i didnt see tht it's in degrees!!! :biggrin:
so ya 2x=45 or 225
x=22.5 or 112.5

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