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Question
secondary 4 | A Maths
4 Answers Below
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Very confused on how to solve these qns. Would appreciate detailed worked solution. Thanks!!
cos (60° - θ )
= cos 60° cos θ + sin 60° sin θ
= 0.5 cos θ + √3/2 sin θ
3 sin θ + 4 cos (60° - θ ) = 2
=> (3+√3/2) sin θ + 4.5 cos θ = 2
do the R formula
. . .
15.
tan θ = 2/x
x = 2 cot θ
OA = 5 + x = 5 + 2 cot θ
sin θ = OM/OA
OM = (5 + 2 cot θ) . sin θ
= 5 sin θ + 2 cos θ
(i) do the R formula
R is the max. value
. . .
16.
area of AOB = 0.5 . 4² . sin x = 8 sin x
area of COD = 0.5 . 6² . sin (90° - x)
= 18 cos x
S = 8 sin x + 18 cos x
do the R formula
S = R sin (x - α)
. . .
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