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Evaluate exact circular-function values by symmetry and periodicity

DIFFICULTYintrostandardchallengeexam
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Question 1 of 8

Calculator allowed

All requested circular-function values are exact unless a choice is requested

The angle is \(\frac{7}{4}\pi\ \mathrm{rad}\)

The requested function is \(\cos\)

4 marks

Give the exact value as P, Q, R and S in (P + Q√R)/S