Category: Trigonometry

Question Number 208755 by efronzo1 last updated on 22/Jun/24 Answered by mr W last updated on 22/Jun/24 Commented by mr W last updated on 22/Jun/24…

Question Number 208638 by lmcp1203 last updated on 20/Jun/24 Terms of Service Privacy Policy Contact: info@tinkutara.com

Question Number 208252 by efronzo1 last updated on 09/Jun/24 $$\cos \left(\frac{2\pi }{21}\right)\cos \left(\frac{4\pi }{21}\right)\cos \left(\frac{8\pi }{21}\right)\cos \left(\frac{10\pi }{22}\right)\cos \left(\frac{16\pi }{21}\right)\cos \left(\frac{20\pi }{21}\right)=?$$ Answered by som(math1967) last updated on 09/Jun/24 $$let\frac{\pi }{21}=x$$$$cos2xcos4xcos8xcos10xcos16xcos20x$$$${cosxcos}\mathrm{2}{xcos}\mathrm{4}{xcos}\mathrm{8}{xcos}\mathrm{10}{xcos}\mathrm{5}{x} \…

Question Number 208104 by Coolkhid999 last updated on 05/Jun/24 Terms of Service Privacy Policy Contact: info@tinkutara.com

Question Number 207516 by MATHEMATICSAM last updated on 17/May/24 $$3{(\sin \theta -\cos \theta )}^4+6{(\sin \theta +\cos \theta )}^2$$$$+4({\sin }^6\theta +{\cos }^6\theta )=?$$ Commented by A5T last updated on 17/May/24 $${Did}\:{you}\:{edit}\:{this}\:{question}\:{to}\:{change}\:{something}?…