Category: Trigonometry

Question Number 111002 by bemath last updated on 01/Sep/20 $$\sqrt{\mathrm{bemath}}$$$$\Rightarrow \sin 14°+\cos 14°\tan 38°-1=?$$ Commented by Khanacademy last updated on 01/Sep/20 $$\alpha \mathit{b}\mathit{e}\mathit{M}\mathit{a}\mathit{t}\mathit{h}\mathbf{\_}\mathit{u}\mathit{z}\mathit{s}\mathit{i}\mathit{z}\mathit{n}\mathit{i}\mathit{n}\mathit{g}\mathit{k}\mathit{a}\mathit{n}\mathit{a}\mathit{l}\mathit{i}\mathit{n}\mathit{g}\mathit{i}\mathit{z}\mathit{m}\mathit{i}$$ Answered…

Question Number 176490 by mnjuly1970 last updated on 20/Sep/22 $$$$$$solve(x,y\in \mathbb{R})$$$$$$$$\{\begin{array}{l}\tan \left(x\right)+\tan \left(y\right)=2\\ \tan \left(2x\right)+\tan \left(2y\right)=2\end{array}$$$$$$$$--------$$ Answered by ajfour…

Question Number 176462 by blackmamba last updated on 19/Sep/22 $$In\mathrm{\Delta }ABCgiven\frac{2a}{\tan A}=\frac{b}{\tan B}$$$$then\frac{\sin {}^{2}A-\cos {}^{2}B}{\cos {}^{2}A+\cos {}^{2}B}=?$$ Commented by cortano1 last updated on 19/Sep/22…

Question Number 176211 by adhigenz last updated on 15/Sep/22 Answered by mahdipoor last updated on 15/Sep/22 $$2021\frac{cos(a+b)}{cosa}sinb=\frac{sina}{cosa}$$$$2021\frac{cosa.cosb-sina.sinb}{cosa}sinb=tana$$$$2021cosb.sinb-2021tana.{sin}^{2}b=tana$$$$\Rightarrow{tana}=\frac{\mathrm{2021}{cosb}.{sinb}}{\mathrm{1}+\mathrm{2021}{sin}^{\mathrm{2}} {b}}={f}\left({b}\right)…

Question Number 45085 by Necxx last updated on 08/Oct/18 $$AmotoristtravelledfromAtoB.$$$$Thisisadistanceof142kmatan$$$$averagespeedof60{kmhr}^{-1}.He$$$$spent5/2hoursinBandthen$$$$returnedtoAatanaveragespeed$$$$of80{kmh}^{-1}.$$$$\left.{a}\right){At}\:{what}\:{time}\:{did}\:{the}\:{man}\:{arrive} \…