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secondary 4 | A Maths
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serendipity
Serendipity

secondary 4 chevron_right A Maths chevron_right Singapore

please help thanks

Date Posted: 3 years ago
Views: 460

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Chua Yi Cheng
Chua Yi Cheng's answer
12 answers (Tutor Details)
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!
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sstrike
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5558 answers (A Helpful Person)