Mixed assessment · Question 4
5 written marks
Solve \(\displaystyle \cos(2x+\frac\pi6)=-\frac{\sqrt3}{2}\), for \(\displaystyle -\frac\pi2\lt x\le\frac\pi2\).
Part a · 2 marks
State the interval for \(\displaystyle u= 2x+ \frac{\pi }{6}\).
Part b · 3 marks
Find all the requested values of \(x\).
Complete-answer checking, worked solutions and indicative written criteria.
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