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A curve has parametric equations x = 2 sin θ, y = cos 2θ. Find y in terms of x

y = cos2θ . 2) cos2θ = 1 - 2sin²θ. 3) x = 2sinθ. 4) x² = 4sin²θ. 5) (1/2)x² = 2sin²θ. 6) y = 1 - (1/2)x².
NB
Answered by Nick B. • Maths tutor
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Have you taught before?

I have experience teaching in my own country about the subject.
RA
Answered by Rusab A. • Maths tutor
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I struggle with integration, and don't understand why we need to do it

First, my approach is to ask student to count the squares on the area under a curve. This process is tedious, and only gives an estimation. Next, I show them the formula to do integration, and immediately th...
HY
Answered by Han Y. • Maths tutor
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Below is a question from the Edexcel Maths Core 1 textbook, Solve the equation x^2 + 8x + 10 = 0 using completing the square.

Before we get to solving the equation, let’s first review the method completing the square. Completing the square is simply to convert an equation into the form of (x±a )^2, so it is possible to solve for x....
LZ
Answered by Lily Z. • Maths tutor
6889 Views

How many lines of method should I write in order to get all of the marks?

The examiner is not an alien from space! It is important that you are clear how you got from one line of working to the next however you do not need to do every little part as a separate line of working. If ...
TD
Answered by Tutor35551 D. • Maths tutor
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