Category: Trigonometry

Question Number 21430 by Tinkutara last updated on 23/Sep/17 $$\mathrm{In}\mathrm{any}\mathrm{\Delta }ABC,\mathrm{the}\mathrm{value}\mathrm{of}$$$$2ac\sin \left(\frac{A-B+C}{2}\right)\mathrm{is}$$ Answered by $@ty@mlastupdatedon23/Sep/17$$=2ac\sin \left(\frac{\pi -2B}{2}\right)$$$$=\mathrm{2}{ac}\mathrm{cos}\:{B} \…

Question Number 86878 by jagoll last updated on 01/Apr/20 $$\mathrm{If}\sin {}^{10}\left(\mathrm{x}\right)+\cos {}^{10}\left(\mathrm{x}\right)=\frac{11}{36}$$$$\mathrm{find}\sin {}^{12}\left(\mathrm{x}\right)+\cos {}^{12}\left(\mathrm{x}\right)=?$$ Commented by Prithwish Sen 1 last updated…

Question Number 21297 by NECx last updated on 19/Sep/17 Answered by sma3l2996 last updated on 20/Sep/17 $$2{sin}^{-1}\left(x\sqrt{6}\right)+{sin}^{-1}\left(4x\right)=\frac{\pi }{2}$$$${sin}^{-1}\left(4x\right)=\frac{\pi }{2}-2{sin}^{-1}\left(x\sqrt{6}\right)$$$${sin}\left({sin}^{−\mathrm{1}}…

Question Number 21273 by 8116417733 last updated on 18/Sep/17 $$\cos 70+4\cos 70$$ Terms of Service Privacy Policy Contact: info@tinkutara.com

Question Number 21268 by oyshi last updated on 18/Sep/17 $$ifA+B+C=\pi$$$$soproof$$$$\sin A+\sin B+\sin C=4\cos \frac{A}{2}\cos \frac{B}{2}\cos \frac{C}{2}$$ Answered by myintkhaing last updated on 18/Sep/17 $$\mathrm{L}.\mathrm{H}.\mathrm{S}=\:\mathrm{sin}\:\mathrm{A}+\mathrm{sin}\:\mathrm{B}+\mathrm{sin}\:\mathrm{C} \…