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secondary 3 | A Maths

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

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

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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