Category: Trigonometry

Question Number 111427 by weltr last updated on 03/Sep/20 $$4\sin {}^6\alpha +4\cos {}^6\alpha -3\cos {}^{2}2\alpha$$ Commented by Dwaipayan Shikari last updated on 03/Sep/20 Question no 111426 Terms…

Question Number 111382 by john santu last updated on 03/Sep/20 Commented by kaivan.ahmadi last updated on 03/Sep/20 $${sec}^{2}x=12+secx\Rightarrow {sec}^{2}x-secx-12=0\Rightarrow$$$$(secx-4)(secx+3)=0\Rightarrow secx=4,secx=-3$$$${by}\:{hypothesis}\:{secx}>\mathrm{0}\:{so}\:{we}\:{have}\:{secx}=\mathrm{4} \…

Question Number 45794 by Tawa1 last updated on 16/Oct/18 Answered by MJS last updated on 16/Oct/18 $$a\ast c=b\Rightarrow b\ast c^{-1}=a\Rightarrow c^{-1}=b$$$$b\ast c=d\Rightarrow d\ast c^{-1}=b\Rightarrow c^{-1}=b$$$${c}\ast{c}={a}\:\Rightarrow\:{a}\ast{c}^{−\mathrm{1}}…

Question Number 45777 by habtetacke last updated on 16/Oct/18 $$2\cos \frac{3\pi }{7}=\frac{24+\sqrt{3a}}{72}wherea=-27+4\sqrt{147.4}$$ Commented by MJS last updated on 17/Oct/18 $${\mathrm{what}}^{\prime }\mathrm{s}\mathrm{the}\mathrm{question}?$$ Terms of Service…

Question Number 176812 by mathlove last updated on 27/Sep/22 $$tan(a-b)=xandtan(a+b)=y$$$$thentan2\alpha =?$$ Commented by cortano1 last updated on 27/Sep/22 $$\tan 2a=?$$ Answered…