I keep getting the wrong answer, need some help thanks

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secondary 3 | A Maths
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secondary 3 A Maths

I keep getting the wrong answer, need some help thanks

Date Posted: 6 years ago

Jiayang

6 years ago

Here're some hints

cos(-x) = cos(x)
sin(-x) = -sin(x)

Factorise

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Date Posted: 6 years ago