IB Math HL Trigonometry Test 2 2013 P1 Q3

IB Math HL Trigonometry Test 2 2013 P1 Q3

IB Year 6 | Grade 12
6 marks
  1. Show that \(\sin^4x+\cos^4x=1-\frac12\sin^22x\).[3]
  2. Find \(\sin^4\frac{\pi}{8}+\cos^4\frac{\pi}{8}\).[3]

Solution:

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Answer:(b) \(\frac34\).

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