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secondary 4 | A Maths
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secondary 4 chevron_right A Maths chevron_right Singapore

Help to solve cos C

Date Posted: 4 years ago
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lim
Lim's answer
154 answers (A Helpful Person)
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hope it help
MM
MM
4 years ago
Thanks
MM
MM
4 years ago
Reason for sin c/2 is positive
lim
Lim
4 years ago
C is acute angle，sin（C/2）＞0
MM
MM
4 years ago
Thank you