IB Math HL Trigonometry Test 7 2018 P1 Q1

IB Math HL Trigonometry Test 7 2018 P1 Q1

IB Year 6 | Grade 12

5 marks

Use a formula for \(\cos2x\) to find the exact value of \(\sin67.5^\circ\) in the form \(\frac{\sqrt{a+\sqrt a}}{a}\).[5]

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Answer:\(\frac{\sqrt{2+\sqrt2}}{2}\), so \(a=2\).

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