Tham KY's answer to Yang li shuang's Secondary 4 A Maths Singapore question.
Hi but the answer for sin2x is 1 - b^2 or a^2 - 1
Qn didn't say in only a or only b for sin2x... Without checking the answer, you won't know... Your answer should be acceptable... Check the other photo uploaded, it showed how to get the format same as the answer key...