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secondary 4 | A Maths
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Carolyn
Carolyn

secondary 4 chevron_right A Maths chevron_right Singapore

Pls help in this qn thank you :)

Date Posted: 4 years ago
Views: 253
Eric Nicholas K
Eric Nicholas K
4 years ago
Will have a look at this R-formula question by 4 am.
snell
Snell
4 years ago
OAB = θ

AB = 17 cos θ
OB = 17 sin θ

OC = 31 cos θ
CD = 31 sin θ

BC = OC - OB
= 31 cos θ - 17 sin θ


AB + BC + CD
= 17 cos θ + 31 cos θ - 17 sin θ + 31 sin θ

= ( 48 cos θ + 14 sin θ ) cm


here onwards,
u use R formula :
48 cos θ + 14 sin θ = R cos( θ - α )
for part (ii)


(iii)
max value is R

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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
1st
Good evening Carolyn! Here are my workings for the proving part.
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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
Good evening Carolyn! Here are my workings for the second part.
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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
Good evening Carolyn! Here are my workings for the third part.