IB Math HL Trigonometry Test 5 2016 P1 Q1

IB Math HL Trigonometry Test 5 2016 P1 Q1

IB Year 6 | Grade 12
5 marks

Given that \(A+B=\frac{\pi}{4}\) and \(\tan A=\frac23\), find

  1. \(\tan B\)[2]
  2. \(\cos2B\)[3]

Solution:

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Answer:(a) \(\frac15\). (b) \(\frac{12}{13}\).

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