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C2 DOUBT edexcel

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halosh92:
could someone plz answer this question?? :-\ ??? ??? ???

astarmathsandphysics:
4 only include one or roots at 360, 0

halosh92:

--- Quote from: astarmathsandphysics on April 08, 2010, 07:19:37 pm ---4 only include one or roots at 360, 0

--- End quote ---
i dont get why u chose such places to places the tan curve :S

astarmathsandphysics:
They asked for answers in the range 0-360

vanibharutham:
heres a way you can try

sin2x = tan2x
sin2x = sin2x / cos2x

sin2x cos2x = sin2x
sin2x cos2x - sin2x = 0
sin2x ( cos 2x - 1) = 0

sin 2x = 0 and cos 2x = 1

you come out with

x = 0, 90, 180, 270, 360

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