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3.4 Trigonometry (A-level only)

3.4 Trigonometry (A-level only)

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Question 12
a.

When x x\,x is small, show that sin⁡(2x)cos⁡(4x)\sin(2x) \cos(4x)sin(2x)cos(4x) can be approximated by 2x−16x32x - 16x^32x−16x3

[3]
b.

Hence, approximate the value of sin⁡(0.2)cos⁡(0.4)\sin(0.2) \cos(0.4)sin(0.2)cos(0.4)

[2]
c.

Calculate the percentage error in your approximation

[1]
Markscheme

3.4 Trigonometry (A-level only) Questions

  1. A Level
  2. /Maths
  3. /3.4 Trigonometry (A-level only)

221 exam-style questions on CCEA A Level Maths 3.4 Trigonometry (A-level only), covering 3.4.1 Trigonometry (A-level only), 3.4.2 Trigonometry (A-level only), 3.4.3 Trigonometry (A-level only), 3.4.4 Trigonometry (A-level only), 3.4.5 Trigonometry (A-level only), 3.4.6 Trigonometry (A-level only), 3.4.7 Trigonometry (A-level only), and 3.4.8 Trigonometry (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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