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1.7.21 Use identities to solve equations (A-level only)

1.7.21 Use identities to solve equations (A-level only)

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Question 4

A student solves cos⁡(2x+15°)=0.3\cos(2x+15°)=0.3cos(2x+15°)=0.3 for 0°⩽x<180° 0°\leqslant x<180°\,0°⩽x<180° and gives only x=28.8°x=28.8°x=28.8°.

Explain why the answer is incomplete and find the complete solution set, giving values to 1 decimal place.

[5]
Markscheme

1.7.21 Use identities to solve equations (A-level only) Questions

  1. A Level
  2. /Maths
  3. /1.7.21 Use identities to solve equations (A-level only)

37 exam-style questions on OCR (MEI) A Level Maths 1.7.21 Use identities to solve equations (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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