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Question 46

The voltage $V$ in an electrical circuit is modeled by the function

\frac{1}{9}t^9 + 2\cos t

for $\in \mathbb{R}$ , where $t$ is the time in seconds. Use proof by contradiction to prove that the voltage function has no stationary points.

[5]

Markscheme

1.1 Proof Questions

A Level
Maths
1.1 Proof

132 exam-style questions on OCR (MEI) A Level Maths 1.1 Proof, covering 1.1.1 Structure of mathematical proof, 1.1.2 Disproof by counter example, 1.1.3 Proof by contradiction (A-level only), and 1.1 Proof. Each one has a worked solution and a mark scheme showing where the marks go.

1.1 Proof

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1.1 Proof

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Question 46

The voltage $V$ in an electrical circuit is modeled by the function

\frac{1}{9}t^9 + 2\cos t

for $\in \mathbb{R}$ , where $t$ is the time in seconds. Use proof by contradiction to prove that the voltage function has no stationary points.

[5]

Markscheme

1.1 Proof Questions

A Level
Maths
1.1 Proof