Lawrence birthday she's been given some money she spends 1 it done a meal and 2/3 on money on clothes what fraction of the money is left​

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This is the guy aboves work, I just wrote it out so you can copy and paste easier.

2sin^2x-cos^2x-2=0

sin^2x+cos^2x=1

cos^2x=1-sin^2x

2sin^2x-(1-sin^2x)-2=0

2sin^2x -1 +sin^2x-2=0

3sin^2x-3=0

3sin^2x=3

sin^2x=1

sin x =(sqr root)1

sin x= + or - 1

sin x =1    sin x = -1

x= sin^-1(1)   x=sin^-1 (-1)

x=90+n360    x=270 + 360n

x=90, 270 (wrote down so it stands out more)