Pls help me with this 3 question ASAP i am not sure how to prove it

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secondary 3 | A Maths
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secondary 3 A Maths Singapore

Pls help me with this 3 question ASAP i am not sure how to prove it

Date Posted: 1 year ago

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A and b

Date Posted: 1 year ago

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Part c

Date Posted: 1 year ago