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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.
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Answered by Nick B. • Maths tutor
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Explain one advantage and one disadvantage of using open questions in an interview.

An advantage of open questions is that respondents are given the freedom to elaborate on their answers providing in-depth accounts compared to closed questions. A disadvantage is that responses may lack reli...
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Answered by Marta P. • Psychology tutor
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Describe two strengths of the behaviourist approach.

One strength is that the behaviourist approach is scientific in its methodology. This is a strength because scientific methods such as laboratory experiments allow great control over variables. This makes it...
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Answered by Marta P. • Psychology tutor
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Describe two assumptions of the biological approach.

1 - brain organisation. There are 4 lobes; frontal, parietal, occipital, and temporal. Each lobe has its own function. The brain is split into 2 hemispheres. The left hemisphere is associated with logical th...
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Answered by Marta P. • Psychology tutor
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Explain how The Monetary Policy Committee controls inflation within the UK economy.

The Monetary Policy Committee’s primary role is to control inflationary pressures within the UK economy to achieve a target of 2% inflation and sustain price stability. The Monetary Policy Committee controls...
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Answered by Olivia O. • Economics tutor
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