Interactive practice questions
Solve $\cos2x=0.9$cos2x=0.9 for $0\le x$0≤x$<$<$2\pi$2π.
Give your answers correct to two decimal places.
Medium
5min
Solve $\sin\left(x-\frac{\pi}{4}\right)=\frac{1}{\sqrt{2}}$sin(x−π4)=1√2 for $-\pi\le x$−π≤x$<$<$\pi$π.
Medium
1min
Solve $\cos\left(x+\frac{\pi}{4}\right)=-\frac{1}{\sqrt{2}}$cos(x+π4)=−1√2 for $0\le x$0≤x$<$<$2\pi$2π.
Medium
3min
Solve $\tan\left(2x-\frac{\pi}{6}\right)=-\frac{1}{\sqrt{3}}$tan(2x−π6)=−1√3 for $0\le x\le\pi$0≤x≤π.
Medium
1min
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