Greenrune113 Greenrune113
  • 17-05-2018
  • Mathematics
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QF Q8.) Use an identity to solve the following equation

QF Q8 Use an identity to solve the following equation class=

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EEPJR
EEPJR EEPJR
  • 17-05-2018
11 pi/6 and 0

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*note: it is 11pi/6 not 11pi/12
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nustopocru nustopocru
  • 18-05-2018

Using trigo identity cos2x=1-2sin^2x


cos2x=1-2sin^2x=sinx+1


1-2sin^2x=sinx+1


2sin^2x+sinx=0


sinx(2sinx+1)=0


sinx=0 or -1/2


x=0, π, 7π/6, 11π/6


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