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sergij07 [2.7K]
3 years ago
14

QF Q8.) Use an identity to solve the following equation

Mathematics
2 answers:
Nookie1986 [14]3 years ago
6 0

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


elena55 [62]3 years ago
5 0
11 pi/6 and 0

see photo

*note: it is 11pi/6 not 11pi/12

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