Question and Answers Forum

All Questions      Topic List

Trigonometry Questions

Previous in All Question      Next in All Question      

Previous in Trigonometry      Next in Trigonometry      

Question Number 97346 by bobhans last updated on 07/Jun/20

Answered by john santu last updated on 07/Jun/20

$$1+3\sqrt[3]{2}\sqrt[3]{{\left(\sin \mathrm{xcos}\mathrm{x}\right)}^2}=2$$$$3\sqrt[3]{2}\sqrt[3]{\frac{1}{4}{\sin }^{2}2\mathrm{x}}=1$$$$54\left(\frac{1}{4}\sin {}^{2}2\mathrm{x}\right)=1$$$$\sin {}^{2}2\mathrm{x}=\frac{2}{27}\Rightarrow \cos 2\mathrm{x}=\pm \sqrt{\frac{25}{27}}$$$$\cos 2\mathrm{x}=\pm \frac{5}{3\sqrt{3}}$$

Commented by bobhans last updated on 08/Jun/20

$$\mathrm{thank}\mathrm{you}$$

Terms of Service

Privacy Policy

Contact: info@tinkutara.com