Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
junior college 1 | H2 Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
Hey could someone help me with this question?
Date Posted: 2 years ago
Views: 610
when the question says "give answer to n significant figures / decimal places" or "use numerical method", it means you can use your GC to find the answer.
using GC (TI-84) ...,
1. by plotting the curve, then using [calc][2:zero], find the x-coordinates of A & B.
0.52359 (pi/6) & 2.61788 (5pi/6)
2. by using [math][9:fnInt], calculate the definite integral for the boundaries found in step 1,
-3.82644
note that when region is below x-axis, the definite integral will be negative. just apply modulus to the value & give the answer as (positive) 3.83 (to 3 s.f.).
generally, as long as question does not say "do not use calculate ..." or "give exact answer", it means you can use GC.
if the question had said "give exact answer" ...
integrate y = 2cos2x -1 gives (sin2x) - x.
applying the boundaries give answer as
-sqrt[3]-2pi/3
(remember to apply modulus & give final answer as sqrt[3}+2pi/3).
using GC (TI-84) ...,
1. by plotting the curve, then using [calc][2:zero], find the x-coordinates of A & B.
0.52359 (pi/6) & 2.61788 (5pi/6)
2. by using [math][9:fnInt], calculate the definite integral for the boundaries found in step 1,
-3.82644
note that when region is below x-axis, the definite integral will be negative. just apply modulus to the value & give the answer as (positive) 3.83 (to 3 s.f.).
generally, as long as question does not say "do not use calculate ..." or "give exact answer", it means you can use GC.
if the question had said "give exact answer" ...
integrate y = 2cos2x -1 gives (sin2x) - x.
applying the boundaries give answer as
-sqrt[3]-2pi/3
(remember to apply modulus & give final answer as sqrt[3}+2pi/3).
See 1 Answer
360 Tutoring Program