Liu HK's answer to Sonia's Secondary 4 A Maths Singapore question.
No.
2 sin2 x - 2 sin x - 2 = 0
sin2 x - sin x - 1 = 0
It's 1, not 2.
2 sin2 x - 2 sin x - 2 = 0
sin2 x - sin x - 1 = 0
It's 1, not 2.
Thanks for the help, I make careless mistakes sometimes. I will check for them in the future to avoid giving the wrong answers.
Not to worry, your workings are correct thereafter. I do make errors from time to time.
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