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secondary 3 | A Maths
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hi, how to solve? :(
Date Posted: 5 years ago
Views: 420
use R formula
yeah but how??
let θ = x+π/12
eqn becomes
2cosθ + 3sinθ = 1.8
convert to R formula:
=> Rcos(θ - α) = 1.8
u find R and α first before u continue with Rcos(θ - α) = 1.8
eqn becomes
2cosθ + 3sinθ = 1.8
convert to R formula:
=> Rcos(θ - α) = 1.8
u find R and α first before u continue with Rcos(θ - α) = 1.8
Have you got the ans?
i got it but only one answer :( can u help?
oh coz u must find for 2 quadrants, first one and 4th one since cos is positive. The one u found was probably the first quadrant ..
yeah i found two but only the 1st quadrant answer is correct apparently? i got a 4th quadrant answer too but the textbook said it wasn’t correct :(
Oh.. lol what even. Did u take 360-basic angle..maybe u got that part wrong
Hhaah I also hv the same textbook I think..the solutions r sometimes wrong also lol
did u work in radian, instead of degree?
after u hv gotten the ans for θ, did u continue to find x? (becos we let θ = x+π/12)
the ans shld x , not θ
after u hv gotten the ans for θ, did u continue to find x? (becos we let θ = x+π/12)
the ans shld x , not θ
yep i did everything :(
See 1 Answer
done
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okay, here u go.
hope this helps.
hope this helps.
Date Posted:
5 years ago
btw, u din state the range of values for x.
i assume it is 0 < x < 2π
i assume it is 0 < x < 2π
yep it is! thank you so much :) i finally understand it
glad that u understand
do compare with ur own workings (previously) and learn where u hv gone wrong.
learn from ur mistakes would help u do better in other qns in future.
and thanks for ur upvote! :)
do compare with ur own workings (previously) and learn where u hv gone wrong.
learn from ur mistakes would help u do better in other qns in future.
and thanks for ur upvote! :)
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