Trigonometry Q
So my question is, isn't the approach in the mark scheme in eliminating theta long-winded?
I mean, can I not just say that 3cos2theta (which is x) = 3(1-2sin^2theta) which simplifies to 3-3y^2
Therefore, x = 3-3y^2
Original post by ps1265A
So my question is, isn't the approach in the mark scheme in eliminating theta long-winded?
I mean, can I not just say that 3cos2theta (which is x) = 3(1-2sin^2theta) which simplifies to 3-3y^2
Therefore, x = 3-3y^2
So my question is, isn't the approach in the mark scheme in eliminating theta long-winded?
I mean, can I not just say that 3cos2theta (which is x) = 3(1-2sin^2theta) which simplifies to 3-3y^2
Therefore, x = 3-3y^2
I cannot tell what you are saying
Are you saying
If so, yes
But you seem to think that the RHS = which it isn't
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