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secondary 3 | A Maths

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##### Dunelm

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Need help with qn (f) and (d). Thank You

Date Posted: 9 months ago
Views: 98
Ryan
9 months ago
Part (f)

3sin²(x) = 2
sin²(x) = 2/3
sin(x) = ±√2/3

sin(x) = √2/3 or sin(x) = −√2/3

you should be able to carry on from here
Ryan
9 months ago
Part (d)

2sin²(x)cos(x) - cos(x) = 0
cos(x)(2sin²(x) - 1) = 0

cox(x) = 0 or 2sin²(x) - 1 = 0

2sin²(x) = 1
sin²(x) = 1/2
sin(x) = ±√1/2
sin(x) = √1/2 or sin(x) = -√1/2

you should be able to carry on from here! jiayous! and look at the equations from basics. don’t think too complicated. simplify it as much as you can and move on from there! i’m sure you have the trigo formula table as well so use it to its maximum and all the best!

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