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Question
secondary 4 | A Maths
2 Answers Below
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please help thanks
Date Posted: 3 years ago
Views: 460
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done
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clear
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use the formula where cos(a+b) = cos(a)cos(b) - sin(a)sin(b) and cos(a-b) = cos(a)cos(b) + sin(a)sin(b) to expand out the fraction. i hope you understand!
Date Posted:
3 years ago
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