Category: Algebra

Question Number 217843 by hardmath last updated on 22/Mar/25 Commented by AntonCWX8 last updated on 22/Mar/25 $$WhatdoestheRandrrepresents?$$ Commented by hardmath last updated on…

Question Number 217857 by hardmath last updated on 22/Mar/25 $$\mathrm{Prove}\mathrm{that}:$$$$\sqrt[3]{\cos 20°}+\sqrt[3]{\cos 80°}+\sqrt[3]{\cos 160°}=\sqrt[3]{\frac{3\cdot \sqrt[3]{9}-6}{2}}$$ Answered by Frix last updated on 22/Mar/25 $$\mathrm{Staying}\mathrm{in}\mathbb{R}\Rightarrow \sqrt[3]{\cos 20°}=-\sqrt[3]{\cos 160°}\Rightarrow$$$$\mathrm{cos}\:\mathrm{80}°\:=\frac{\mathrm{3}}{\mathrm{2}}\sqrt[{\mathrm{3}}]{\mathrm{9}}−\mathrm{3}\approx.\mathrm{12} \…

Question Number 217789 by hardmath last updated on 21/Mar/25 Commented by mr W last updated on 21/Mar/25 $$?=\sqrt{{(27+12+15)}^2-4\times 27\times 15}=36$$ Commented by mr W…

Question Number 217802 by Ismoiljon_008 last updated on 21/Mar/25 Commented by Ismoiljon_008 last updated on 21/Mar/25 $$a+b=cThenR=?$$$$Helpme,please$$$$$$ Commented by…

Question Number 217766 by ArshadS last updated on 20/Mar/25 $$Solveforx\mathrm{\&}y$$$$\frac{1}{x}+\frac{1}{y}=5$$$$\frac{1}{x^2}+\frac{1}{y^2}=13$$ Answered by Ghisom last updated on 20/Mar/25…