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secondary 4 A Maths Singapore

Hi pls help me with qn 13. Answer for cos2x is ab and sin2x is 1 - b^2 or a^2 - b. I got (a^2 -b^2)/2 for sin2x. Pls help me thank you very much! Part ii too

Date Posted: 3 years ago

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Date Posted: 3 years ago

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Yang Li Shuang

3 years ago

Hi but the answer for sin2x is 1 - b^2 or a^2 - 1

Tham KY

3 years ago

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...

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