Question Number 175585 by mnjuly1970 last updated on 03/Sep/22 $$ \\ $$$$\:\:\:{in}\:{A}\overset{\Delta} {{B}C}\:\:{prove}\:\:{that}: \\ $$$$\:\:\: \\ $$$$\:\:\:\:\:\:\:\:{sin}\:\left(\frac{\:{A}}{\mathrm{2}}\:\right)\:\leqslant\:\frac{\:{a}}{\:{b}\:+\:{c}}\:\:\:\:\:\:\:\blacksquare \\ $$$$ \\ $$ Commented by mahdipoor last…
Question Number 175571 by mnjuly1970 last updated on 02/Sep/22 Answered by behi834171 last updated on 03/Sep/22 $$\boldsymbol{{cos}}\frac{\boldsymbol{{A}}}{\mathrm{2}}=\sqrt{\frac{\boldsymbol{{p}}\left(\boldsymbol{{p}}−\boldsymbol{{a}}\right)}{\boldsymbol{{bc}}}}\:\:\boldsymbol{{and}}\:\boldsymbol{{so}}\:\boldsymbol{{on}}… \\ $$$$\frac{\boldsymbol{{a}}\left(\boldsymbol{{b}}+\boldsymbol{{c}}\right)}{\boldsymbol{{bccos}}^{\mathrm{2}} \frac{\boldsymbol{{A}}}{\mathrm{2}}}=\frac{\boldsymbol{{a}}\left(\boldsymbol{{b}}+\boldsymbol{{c}}\right)}{\boldsymbol{{p}}\left(\boldsymbol{{p}}−\boldsymbol{{a}}\right)}\:\:\:\boldsymbol{{and}}\:\boldsymbol{{so}}\:\boldsymbol{{on}}…. \\ $$$$\Rightarrow{lhs}=\frac{\boldsymbol{{a}}\left(\boldsymbol{{b}}+\boldsymbol{{c}}\right)}{\boldsymbol{{p}}\left(\boldsymbol{{p}}−\boldsymbol{{a}}\right)}+\frac{\boldsymbol{{b}}\left(\boldsymbol{{c}}+\boldsymbol{{a}}\right)}{\boldsymbol{{p}}\left(\boldsymbol{{p}}−\boldsymbol{{b}}\right)}+\frac{\boldsymbol{{c}}\left(\boldsymbol{{a}}+\boldsymbol{{b}}\right)}{\boldsymbol{{p}}\left(\boldsymbol{{p}}−\boldsymbol{{c}}\right)}= \\ $$$$\geqslant\sqrt[{\mathrm{3}}]{\frac{\boldsymbol{{abc}}\left(\boldsymbol{{a}}+\boldsymbol{{b}}\right)\left(\boldsymbol{{b}}+\boldsymbol{{c}}\right)\left(\boldsymbol{{c}}+\boldsymbol{{a}}\right)}{\boldsymbol{{p}}^{\mathrm{2}} \boldsymbol{{S}}^{\mathrm{2}}…
Question Number 44478 by peter frank last updated on 29/Sep/18 $${prove}\:{that}\:\mathrm{2tan}^{−\mathrm{1}} \left(\sqrt{\frac{{a}−{b}}{{a}+{b}\:}}\:\:\mathrm{tan}\:\frac{\theta}{\mathrm{2}}\right)=\mathrm{cos}^{−\mathrm{1}} \left(\frac{{b}+{acos}\theta}{{a}+{bcos}\theta}\right) \\ $$ Answered by tanmay.chaudhury50@gmail.com last updated on 29/Sep/18 $${RHS} \\ $$$${cos}^{−\mathrm{1}}…
Question Number 175544 by cortano1 last updated on 02/Sep/22 $$\:\mathrm{tan}\:^{\mathrm{6}} \left(\mathrm{10}°\right)+\mathrm{tan}\:^{\mathrm{6}} \left(\mathrm{50}°\right)+\mathrm{tan}\:^{\mathrm{6}} \left(\mathrm{70}°\right)=? \\ $$ Commented by Frix last updated on 29/Jan/23 $$\mathrm{433} \\ $$…
Question Number 175493 by ajfour last updated on 31/Aug/22 $$\mathrm{tan}^{−\mathrm{1}} \left({a}\mathrm{sin}\:\theta\right)=\mathrm{sin}^{−\mathrm{1}} {b}−\theta \\ $$$${find}\:\theta. \\ $$ Commented by Frix last updated on 01/Sep/22 $$\mathrm{I}\:\mathrm{tried}\:\mathrm{but}\:\mathrm{it}\:\mathrm{leads}\:\mathrm{to}\:\mathrm{a}\:\mathrm{4th}\:\mathrm{degree}\:\mathrm{polynome} \\…
Question Number 109955 by toa last updated on 26/Aug/20 $$\mathrm{what}\:\mathrm{is}\:\mathrm{the}\:\mathrm{minimal}\:\mathrm{period}\:\mathrm{of}\:\mathrm{cosx}+\mathrm{cos3x} \\ $$ Answered by mathmax by abdo last updated on 26/Aug/20 $$\mathrm{2}\pi \\ $$ Commented…
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Question Number 109910 by bemath last updated on 26/Aug/20 Commented by qwerty111 last updated on 26/Aug/20 Commented by qwerty111 last updated on 26/Aug/20 $$\boldsymbol{{Shuni}}\:\:\boldsymbol{{soddalashtirib}}\:\:\boldsymbol{{qo}}'\boldsymbol{{ying}}\:\:\boldsymbol{{chiqadi}}.\boldsymbol{{Siz}}\:\:\boldsymbol{{o}}'\boldsymbol{{zbekmisiz}}\:? \\…
Question Number 109820 by moses ogwuch last updated on 25/Aug/20 $${tan}^{\mathrm{2}} {x}+{tan}^{\mathrm{2}} \mathrm{2}{x}+{tan}^{\mathrm{2}} \mathrm{4}{x}=\mathrm{33} \\ $$$${find}\:{x}\:\:\:\left({show}\:{full}\:{solution}\:{please}\right) \\ $$ Commented by Sarah85 last updated on 25/Aug/20…