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secondary 3 | A Maths
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hi! im having problems w this question, cld someone help? thanks!
Date Posted: 7 years ago
Views: 320
There are several approaches to this question.
1) the right hand side of the equation is a double angle for cosine. So
cos^2(x)- sin^2(x) = cos(2x).
Substitute cos(2x) and solve from there
2) cos^2(x) + sin^2(x) =1
Cos^2(x) = 1-sin^2(x)
Substitute this in the equation and rearrange to have sin^2(x) on one side. Solve from there. Similarly you can use this method with substituting sin^2(x) instead
Hope that helps
1) the right hand side of the equation is a double angle for cosine. So
cos^2(x)- sin^2(x) = cos(2x).
Substitute cos(2x) and solve from there
2) cos^2(x) + sin^2(x) =1
Cos^2(x) = 1-sin^2(x)
Substitute this in the equation and rearrange to have sin^2(x) on one side. Solve from there. Similarly you can use this method with substituting sin^2(x) instead
Hope that helps
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